The Leprechaun is a really nice bike. If he paid that for a new one, he got a screamin deal, as they usually sell for $800-1500 used, depending on the year and the condition. Haluzak make some of the best swb recumbents around. I had one for a couple of years and regret selling it. I never had any problem with the seat, and being a heavy rider, I think if it was going to break it would have.
The Leprechaun is identical to the Horizon except for the smaller front wheel to accomodate shorter riders. (I am 5'4" and it fit me perfectly) He may find he has a bit of heel strike in sharp turns,as I did, but it was easily remedied with the addition of pedal extenders. Hope he enjoys his new bike...it's a good 'un!