On the other hand, DP4 was reported not to be very stable.
On the other hand, DP4 was reported not to be very stable.
Their DP releases aren't current. They're older, generally more stable snapshots.
EDIT: This means that they've been improving stability long since the last DP, and have been using the bug reports and crash reports from the DPs to diagnose and fix problems as well.
I'm using DP4 to make sure my app (getcloak.com) is compatible -- I've found DP4 to be quite buggy: Kernel panics not evidently tied to third party drivers, crashes in Safari, plenty of UI glitches etc. Oh, and Ableton Live doesn't work, not that this is necessarily Apple's fault.
This is on a late-2010 MacBook Pro. My impression talking to friends is that this is not an uncommon experience, though clearly not everyone has these issues.
That said, I used to work at Microsoft. Next to the (years of) beta builds of Vista I had to suffer through, Lion is practically paradise. ;-)