Well, I saw a notice some time ago on Toshiba's website that they were going to stop making the BIPU, but will ship as long as they have stock. The LIPU does everything a BIPU-M and Q does, and more. Bad part is that an LIPU requires an IP license, while a BIPU only needs enough port licenses.

I just put in an LIPU into a CIX-100 (wall mount) yesterday (with the new 4.0 proccessor).