Hopefully a port for Amiga will be made now.
I dont know how quality compares to mp3pro and wma (windows media audio?) since i dont have encoders for these (and am not even bothered to find one for windows)
I have encoded some tracks to both .ogg and .mp3 and .ogg sounds a little bit better with more stereo effect. especially at lower bitrates.
Encoding and decoding is slower compared to mp3 and playing .ogg uses more processor power but that could be because i am using pre-release versions that are not optimized.
I dont mind paying for something good but I am always interested in free stuff :-) (that counts for both money-wise and usage restrictions wise)