Kyd, we're playing fair here: DaisyDisk 1 won't silently update to v2 with sparkle, it's a lame solution. BUT DaisyDisk 1.x has a build-in mechanism for detecting availability of 2.x and knows upgrade terms (free of discounted). Licensing policy is also explained in both manual and registration dialog. We'd rather get less money than have disappointed users
As for 10.7 compatibility, there's a little we know about it currently. We do know that some Apple employees used it on 10.7 (at least that's what our records reveal), so it should work. If it won't — we'll fix the issue ASAP.
DaisyDisk Team member