I use Astro, and the 2 problems i have are:
-having to sit there and click install, then done over and over again
-it doesnt register in the marketplace that you have that app installed.
to explain the second one more clearly: if you download and install an app from the marketplace, it automatically alerts you for updates, but if you install from astro, your stuck with the version you have backup-ed unless you go into the market place and re-download it.
is there any auto-installer known? or something to link apps to their marketplace pages? I realize the installing thing is probably a set security standard in android, so i'm not really expecting one for that