You might want to join the homequiltingsystems group at groups.yahoo.com and ask there. Someone may have that actual setup, or at least there will be some users with APQS experience. Since it is not affiliated with APQS in any way, the comments should be honest.
To me, it sounds like a reasonable deal -- especially with the one year warranty. My Voyager 17 with Hinterberg frame, no stitch regulator, cost about $3000 (some have gotten this one for as little as $2000). However, mine is a 17" machine whereas the one you are talking about has 36" of space under the arm.
Just offhand, I would suggest making an offer of $5,000 and ask that someone set up the system for you *and* give you at least 2 hours of one-on-one help and instruction on getting started. This type of machine was made to last, so I don't think there will be any major problems about getting service for it or parts; however, I don't know that for sure.