We got very lucky last year and found our new (to us), 2012 Phantom 23P with just 6,200 miles (8.8 hours on the generator), for almost $20,000 less than a new one. Being a smallish, somewhat new company, there simply aren't very many used ones out there but prior to finding ours I was an eyelash away from flying to Elkhart IN to pick up a new one.
I have visited the their factory (home), operation twice and have been nothing but impressed with the high quality of their line up and the way they do business. Despite not buying from them and being well out of warranty they treated us like royalty and stepped up addressing several issues with little or no charge.
They sell factory direct which saves the buyer a lot of money but it also necessitates active participation by the buyer. You will need to work closely with Nexus and plan on at least two trips to Elkhart, one to consummate your purchase and the second to take delivery after a very thorough PDI. They will customize your coach just about anyway you want it but knowing exactly what you want is essential.
The quality of Nexus is some of the best in the industry. Standard features include steel framing, one piece fiberglass roof and end caps, heated tanks, electric awning, and top of the line appliances to name just a few. Spend some time on their website, check the specifications and take note of all that comes standard. The biggest complaint I have heard is that they don't always have the floor plan some folks are seeking.
Yes I am biased but after 18,000+ trouble free miles in less than a year and having been treated so well I can come to no other conclusions. Feel free to PM me if you would like further information.
As always.... Opinions and YMMV