I just bought Mountain Lion and am waiting to get a download code. Agreed, it's a bizarre wait. Are they doing a background check or software scan? 😀 Trying to wait you out? Analyzing the personal data they've collected on you? (Little Snitch constatly shows 'radar submissons @ Apple' trying to access my computer for a look).
The time wait is expected to be 3-5 days. It's obviously being done for a reason.
I want to upgrade for two reasons:
1. Mountain Lion lets you download 'last compatible app' from the App Store. Lion doesn't. A piece of software I have was updated for Mavericks, and dropped Lion / Mountain Lion Support. I needed to reinstall that software as it was buggy, and had to go through hoops / backups / other means to do so, because the App Store told me that this software is not available for my OS any more, even though I bought it.
2. When a piece of software I use gets a point upgrade (bug fixes etc) they sometimes do not qualify older OS's that the previous point fix did qualify for. This is my case. There are cases where having a mismatched OS / Software (even out by a point upgrade on either) causes undesirable results. Lion is being dropped in terms of support very soon, and I want to upgrade to take advantage of the bug fixes.
One recent point upgrade/bug fix in the piece of software I have needs 10.8.4, and since, they released a point upgrade that needs 10.8.5. So that works well for me, and obvioiusly, I'm going with the 10.8.5 one, because it's newer and because that's all that's available for "Mountain Lion"... but ... what if my software wasn't qualified to 10.8.5 yet, and they dropped Lion Support... what would I do then? You can't get 10.8.4 any more. I guess stay on Lion and not do the point upgrade.... meh, until it 'possibly' was qualified.
But finding this post made me think... I should keep a copy of all OS point upgrades. I am downloading Mavericks now as we speak, after seeing this thread -- I will not install (I tried it on a non-critical machine, didn't like it, reverted back w Carbon Copy Cloner). I will download each point update of the software I use going forward it just in case I need it someday. It's only a little hard drive space. Although I don't like it, if I need to upgrade to continue making money with less hassle (less bugs in software) I will.