Is the screen on the iMac 27" too large ?

In the end only you can answer that question. Personally, I use a 27 inch iMac (not Retina) and I'm very happy with the display. It's worth taking the time to get the mouse speed as you find it most convenient, balancing the distance the cursor has to travel against the speed of movement; otherwise I've had no complaints about it. If you are in a very confined space I suppose it might be a little problematic.

If you look at one in an Apple Store, remember they always look smaller in the shop!

no

I have a 21" iMac beside it I have a 27" monitor I use as second display so no

but if you carry it in public transportation, yes

paulgarri wrote:

Is the screen on the iMac 27" too large ?

If the only place you have to set it up is too small for a 21" iMac, then yes, it would be too large. 😎

FWIW, I don't touch type either. I've never had an issue with eye strain or neck aches going between the keyboard and screen. Of course I can't answer for you.

Mine is a previous model, though I assume the newer ones are much the same. From the top of the screen to the desk surface is just under 20 inches. I don't find this a problem: I don't quite touch-type but I don't have to look at the keyboard all the time. As I sit at my desk (slightly slumped) my eyes around an inch below the top of the screen. I think you're less likely to get back and neck problems than with a laptop on the desk which will cause you to hunch over it (if I'm going to use the laptop on the desk I use a stand which brings it up about six inches).

Normally I wear varifocal glasses, having no focussing in my eyesight whatever (age and post-cataracts) but these aren't good with computers as you have to tip your head back to read the screen, so I have a pair of glasses specifically set with a focal length of about 20 inches so that I don't have to cope with that. If you're under about 40 you won't have this issue, it tends to arise as you get old enough to lose acommodation (focussing).

In the end, only you can decide whether it's suitable for you, but I would think you would get used to it quite quickly.