FN P90 / PS90 - yes or no?

[Brian]

Wasn't sure if this is the right forum, but couldn't figure out where else to post it.

I'm debating picking one of these up. For those of you who have shot a PS90 rifle or SBR (or the real full auto p90) - any impressions?
http://www.fnherstal.com/primary-men...-tactical.html

I have no doubt it will be a fun range toy for a couple weeks but am worried it would get old fast, especially with the less common ammo and sit at the back of the safe.