I'm very sceptical of this Mac App Store. As much as I like the idea (apt anyone? :-D) I am very disappointed by it's performance. Neither on SL nor on Lion does it let me update bought apps. Doing the "drag app to trash, click `install', empty trash" mumbo is not really my idea of "working".
If anyone has similar issues, or a fix, that would truly be great!
MAS always updates my purchased apps. I have however heard of it declining to do so if you have, on some attached hard drive, a newer or same-version binary or installer. But have had no problems with MAS myself. YMMV.
If anyone has similar issues, or a fix, that would truly be great!