I have received a few e-mails inquiring what I know about the Perseus by Microtelecom s.r.l. I do not have any experience with this item nor do I know of anyone who owns one.
What I have read thus far is that the Preseus is a software defined VLF-LF-MF-HF receiver based on an outstanding direct sampling digital architecture.
It features a 14 bit 80 MS/s analog-to-digital converter, a high-performance FPGA-based digital down-converter and a high-speed 480 Mbit/s USB2.0 PC interface.

The best I can do is providing you some links to which you may have already found. I think the yahoo group, (linked below) might be the best place to interact with those who have this interesting SDR Receiver.

Microtelecom Preseus page;
http://www.microtelecom.it/perseus/

Microtelecom Preseus Software page;
http://www.microtelecom.it/perseus/software.html

E-ham reviews;
http://www.eham.net/reviews/detail/7227

Universal Radio Inc/ Preseus;
http://www.universal-radio.com/catalog/commrxvr/0122.html

Preseus Yahoo Group;
http://groups.yahoo.com/group/perseus_SDR/