Does anyone who has this know what the max bitrate is for it when making an XVCD or XSVCD?

The review on it at this site say's 2500kbits but I have seen some things that make me question that as some of that info is wrong. Plus the model below has a max bitrate stated of 4700kbits and it doesn't have as many features.

Has anyone done any tests on this or the 502SL which is the same and found the highest bitrate for reading the CD?