I installed the GM build on my MacBook Pro, not sure if it's just psychological but apps definitely feel snappier than in Lion.
Got caught out with one old app that didn't have a developer id (for a 3g dongle) so had to disable the gatekeeper install it then I could reapply gatekeeper.
Otherwise it's been running great for the past few days.
It isn't. Snow Leopard was crazy fast, but Lion bogged down a lot. ML DP2 brought huge performance improvements, basically undoing whatever it was that Lion did.
(I'm a dev, benchmark each and every build for our custom software.)
I'll buy ML when it comes - I used beta 2 and 3 and they were ridiculously stable, but they weren't really as snappy as Snow Leopard on my poor 2009 15" MBP (2.53GHz C2D, with 8GB 1333 RAM and 7200rpm HDD).
Got caught out with one old app that didn't have a developer id (for a 3g dongle) so had to disable the gatekeeper install it then I could reapply gatekeeper.
Otherwise it's been running great for the past few days.