Yes, I prefer to keep my software purchases there as it streamlines my product purchases, updates, and installation on new machines if I upgrade or reformat my Mac. I loathe having to mess with third party software DRM schemes, serial numbers, and the like. It's just an unnecessary hassle IMHO. I have had no problems with TANE purchased on the App Store, and I hope N3V will be bringing the new version to the App Store as well, as I really have little interest in purchasing it direct.
Hopefully with app developers returning to the store plus even Microsoft
soon coming to the store with it's flagship app, it'll increase its legitimacy in the eyes of developers.