Perhaps Apple deleted my post accidentally, and it was your post they thought that was "non-constructive"...
(Don't be offended fanboy512, I'm only kidding.)
Let's see if there are Mac users with actual answers to my questions, because, as I explained, I would like to upgrade after all.
One answer for you, as I used spaces extensively in SL and have been using "spaces" or the desktops in Lion for some time now. The spaces will not work as they did in SL and this took some getting used to for me as well. However, I have found the desktops to be a much better implementation in Lion. I have found the full screen apps to be more efficient than trying to find a window on a cluttered desktop. I have also found that the gestures work extremely well with a Magic Trackpad, which is probably a better choice than the mouse for Lion. You can customize the gestures extensively in Lion in the system preferences.
Dashboard essentially operates identically in Lion and SL except that it is a desktop in Lion, the keyboard shorcut keys work for Dashboard so that should not be a problem.
Mission control works well too, I think the desktop implementation in Lion is much speedier than Exposé in SL. I have not used Lion with a mouse as I purchased the Magic Trackpad at about the same time I installed Lion. A four finger upward swipe gives me Mission Control and is much faster than SL Exposé
I have not yet found the Launchpad to be as useful as I had hoped, I am still tied to the dock and finder for apps but I can see where the Launchpad may have its uses.
I have a late 2008 Air with only 2GB RAM and probably pushing the limits for Lion. With that said, it seems to operate fairly well on my Air and the Desktops as well as Mission Control are faster and more efficient for me than their counterparts in SL.
Hope this helps a little.
My points are based on what I've seen of Lion in the announcements.
I hope actual users of Lion have answers to my questions. In the case of Spaces I hope someone tries it all out and explains.
Also, if a Lion user can explain why Mission Control is good for me, I really like to hear that.
To Bradley Olwin,
Thanks for your reply.
What you say about Full-screen apps, gestures, Trackpad versus mouse and even Launchpad, I can agree with, without having touched Lion yet.
Full-screen apps are good for small screens for sure.
But the 1680x1050px (20") I connect my MBP to (pretty average a size I would say) I wouldn't like to use for Full-screen reading e-mail or Full-screen web browsing (although lots of people do - while web sites still get developed for 1024x768px).
Anyway, Apple gives us a choice here, so I won't complain. (Same for Launchpad for that matter, if you don't use it it's not in your way.)
What Spaces (and Exposé) concerns I'm wishing and hoping someone is going to explain you can just save the app before upgrading to Lion and put it in Lions Applications folder and it works like it always did... I try not to feel getting old.
I am using full screen both on the 13" Air screen and on the 23" LED Display. The full screen apps work well with both displays and resize appropriately. You can still assign applications to desktops, which is similar to how spaces used to work. You will not be able to use SL spaces and Exposé, they work differently in Lion, it is integrated into the operating system. I prefer the way they work in Lion compared to SL but that is simply my opinion.
What about the length of lines in things like email?
The screenshots I see all show really long lines, well over 50-80 character lines that are easier to read.
I'd be interested in what options there are for layout in the new mail program, and if you can make it look like the old one which I prefer.
You will not be able to use SL spaces and Exposé, they work differently in Lion,
Well, I don't really agree with this statement. They are setup differently, no question, but once there you can use it like you use it in SL.
control-n sends you to the nth-space and using Expose you can have all the spaces in one screen as in SL.
I think that may be some differences might exist when moving windows around, but I am not sure.
As for Dashboard, it is shown as a Space if you want it to be a Space.
I do and it is the same as before.
My reply to the OP was that he/she wanted to move the SL apps into the Lion OS, which is not possible. Another major difference with desktops is that you cannot specify you want a fullscreen app in a certain desktop and have it stay there, for example, desktop 4. Exposé does work differently in Lion so I was attempting to tell the OP that Lion Mission Control does not work the same, which I believe is true. The only view that you get is the desktops at the top and the selected desktop in the middle of the screen, you don't have the choice of all apps, etc. Thanks for the correction on the dashboard, I had forgotten it could be changed in sys prefs.
I agree you can turn off auto-arrangement but here is the issue, I will give an example. Have 2 desktops open, then open mail in fullscreen then safari in fullscreen. Mail will be in the 3rd desktop and Safari in the 4th. If you quit mail then Safari is now in the 3rd desktop. If you reopen mail it is now in the 4th desktop. So Lion does not behave analogously to SL with respect to spaces. When you put an app in a space it stayed in that space. I have found this a bit disconcerting in Lion. It is much easier to zoom back and forth among desktops and simply not worry where the app is. This behavior won't occur if you do not use fullscreen apps but keep the app in the SL "window" view.
So I don't think that the desktops in Lion can be used the same as SL if you want to take advantage of fullscreen view, which I think is a great implementation.