Im not sure whats with the negative reviews. Its not OK to release a competing product? Strange.
Anyway, I tried the other tangram games currently available on the iPhone and I liked Brians best. Some of my favorite things: Clean uncluttered graphics, lots of puzzles, doesnt force you into portrait mode, hints, and tap to rotate.
Itd be nice to have the ability to chose your next puzzle, rank your puzzle completion time, and adjust the puzzle piece tolerance, but hey, thats what updates are for :-)
rebeld about Tangrams