We have enjoyed our Phoenix Cruiser 2350 for three years now. Ours is on the standard from Phoenix which is the 350 chassis. We tow a Jeep Cherokee Trailhawk and the PC handles the pull well.
Several years ago, we purchased a Gulfstream BT Cruiser on a 450 chassis, so we have had experience with both the 450 and 350. We bought our PC used. The original owner had it less than ten months and decided he wanted a big DP.
On most roads, the 350 is fine and certainly seems to ride better to me than the 450, but I must say in serious mountains I wish the 450 were under me. So, if you are going to do a lot of mostly driving in the flatlands or in less serious mountains (say, 4000 or 5000 feet or less) I think you will find the 350 to work for you. Take on the passes at 10,000 feet in the Rockies and you will wish for a 450.
All that being said, I always remind myself that 90-95% of the time the 350 is a better choice for us and is completely adequate to pull the Trailhawk that weighs out at about 4400 pounds when we flip down the rear seats and pack it full of all the junk we take for multiweek boondocking.
We have been extremely pleased with our Phoenix Cruiser. We studied rigs in the 23-25 foot range for almost two years prior to our purchase. The Phoenix quality is absolutely superb to everything else we saw includinig a couple of comparable brands that just didn't "feel right" for our personal pocket book or tastes. As another post suggested, check out the forum section on the Phoenix Cruiser home page. If you get really serious about buying a PC, join the forum and you will find a lot of really fine folks that can answer any Phoenix related questions in detail.
We found our almost new rig less than four miles from our home! Boy, talk about luck! Phoenix apparently makes only about a hundred total units of all models every year so that are not that easy to find and we were just getting ready to go to the factory and order one when we found ours nearby.
Paul