This is one of the best frameworks I know of on Mac OS X for its purpose. Their lead developer actually came on site to train us and help to write our first application. The frameworks are substantial, on the order of Cocoa so be prepared for a lot of exciting technology. A lot of programming doesn't have to be done because they made their own interface builder for the visuals. The developers are one of the original NeXT heads and definitely know Cocoa in and out. Some of their framework design is stuff I've never seen before, real exciting technology. I also use their other data adapters and they are all designed well. They supply a lot of source code examples, documentation and support which is definitely geared to full time programmers.