I wouldn't spend the $69 to get the USB copy of Lion, but I
would (and did) spend $29 to get the AppStore copy of Lion.
I really like what they have done with Spaces and Launchpad, and find it very easy to keep all of my work in one Space and all of my non-work in another space. This feature isn't new to Lion, but I find it easier to use now with some of the gestures on the multi-touch pad.
Some folks don't like the iPad/iPhone style scrolling, where a swipe
down moves the page
up but having used it for weeks now, I much prefer it to the older style of scrolling.
My two cents: buy it for $29 (app store), but don't buy it for $69 (usb).
musical marv :
Personally do you think it is worth $69 to buy this LION OS? Thanks marv