BM53/BM54 Radio with Single Disc MP3 Player

The people over at Bimmernav have these for sale which purport to be a direct replacement for BM53/BM54 radio.

Best Sellers BMW Navigation BM54 BM53 Radio with Single Disc MP3 Player

Does anyone have any knowledge of or experience with this product?

I currently have a BM53 with the old dead channel problem, and this looks like a resonable solution to replace it with, but I would love to hear from someone who has actual experience with them.

Cheaper than a new BM53, and also adds an additional MP3 disc to replace the useless Hidden Tape Player. Sound quality is also supposedly drastically improved