The Amazon App Store has been a great addition for my Android devices. Being a little too geeky for my own good, I've purchased the Augen Gentouch 78, and recently the Viewsonic G Tablet.
Both devices are not approved for the Google experience, so neither have access to Google's market *(legally that is...). I've used some of the other apps stores available, but they just weren't very polished and the selection of the hot apps tended to be lacking.
Amazon's site is a big improvement, and while the article say the developer's filter did not work with regards to screen size, it actually did work for me (Apparatus loaded on the G Tablet, but not the Gentouch).
I hope everyone accepts that its still a new venture and gives Amazon time to work out the kinks. Google's market wasn't great compared to iTunes apps store when it began either...