Ah, it's kind of fun so far. I'm beginning to like Mission Control and like the way you add spaces and remove spaces, and three-finger slide between full screen apps and spaces. Some weirdness though: sometimes app windows seem to not appear "shrinked" properly in Mission Control.
Running full-screen Safari now. Feels like... BIG.
I know full-screen browsing has been around for a while, but it seems done OK in Safari for Lion.
64bit-ness feels good as well.
Hmm... Autocorrect spelling works too.
A tab was beach balling in Safari but could switch to other tabs.
I like the new iPad-like Mail layout.
Finder windows still don't expand fully (aka maximise like Windows, yes, old habits die hard). So I still use RightZoom app which still works.
Pinch-to-zoom in Safari doesn't expand text like before but follows iPad behaviour. You have to Cmd+ or Cmd- if you want the old behaviour. New behaviour is good for fixed-width kind of website text but not so good for full-width websites like AI. More on this here: http://forums.macrumors.com/showthread.php?t=1196517
A little dash of lagginess on my MBP Core 2 Duo 13" 2010 model with Nvidia 320M. But I find things pick up alright as things get cached into RAM, VRAM, HDD, whatever.
Wow. Autocorrect lets you type quite fast but may take some getting used to.
Bug: "When Safari and MAil is in full screen app (Lion), Cmd-I brings mail compose window in the Mail window, but Cmd-Shift-I opens the mail compose window in an unused workspace. That’s not the way it’s meant to work, so I class it as a bug." See also: http://www.macworld.com.au/help/10-m...ortcuts-34010/
Safari rubber-banding cuts of a tiny bit of the top of a web page sometimes (maybe all the time).CONCLUSION: Unless you've got something mission-critical that you've researched will mess up bad, go for Lion.
Heck, for $29 it's worthwhile entertainment, if nothing else.
You will have to tinker with it a bit to get used to it. Some features are good, some are not so polished up yet.