I got one of these right before it bit it

It always felt like it had potential.  They had the modem for it, they added the analog flight pad for Nights, it had the cartridge slot, and on paper it seemed just as powerful as the PlayStation.  But at the end of the day, they just didn't release that many good games for it.  There were some, but the vast majority were just plain bad. 

Guardian Heroes is a much sought after title.  Best keep it.  It will appreciate in value. 

It was hard to program for.  Instead of one processor, it had two, and they were RISC, which was new at the time.  The other problem was that Sega only released updated programming libraries to third parties after they had used them.  So that's why Virtua Fighter 2 looked so amazing, but most other third party stuff was ass.

It WAS a great 2D game system though.  Sega should have capitalized on that feature more than trying to fight the PS1 on its 3D capabilities.