Well it looks like I'm in the Synmat UL club now. I came across a used Synmat UL 7 (medium) on eBay that has 'two small patches' on it from the Exped warranty department. $75 seemed like a pretty good deal to me. The 'two small patches' appear to be just to the left of the Exped logo....they are indeed very small if I'm seeing the picture correctly (it's larger on my screen, BPL drops the size):
One thing that seems a bit off is the MSRP of the Synmat UL. The Synmat UL is the same basic design as the regular Synmat, but with the Synmat UL you don't get the internal pump, you get less of the same type of insulation but it uses a lighter nylon shell so the price goes up 30% ($119 vs. $155)? I understand the lighter weight nylon might cost Exped a little more since it's a new fabric, but surely the deletion of the entire internal pump mechanism along with using significantly less insulation (R. 3.1 vs. R 4.9) is enough to offset this. Exped also sells the Synmat Basic with is just a regular Synmat with no pump, less insulation and different baffle construction and it's $80.
It seems that the NeoAir might be the more durable pad, despite initial impressions here. I trust that the Synmat UL uses nicer fabric (ie. not as loud and plastic feeling) and I do look forward to that, but it's thinner nylon (20 denier vs. 30 denier) so the NeoAir should have the tougher shell of the two. I've also found one report of the baffles coming apart in the Synmat UL, which I've never yet heard of for the NeoAir despite it's tremendous popularity.
"Another former Neoair user...The UL7 is...less slippery."
I'm a little suspicious about the 'less slippery' thing. The BPL measured the NeoAir as a lot more grippy, and on REI.com there are 23 reviews for the Synmat, of which 4 people (17 %) mention 'slips easy' is somewhat of a problem. With the NeoAir there are 131 reviews and 9 (7%) say it slips, which is a far lower percentage.
"I store mine under my bed with both valves open."
When stored with the valves open, does the mattress puff up a little due to the insulation? Or is the insulation too weak to actually inflate the mattress at all. If it did puff up the mattress a bit, that would really help with drying it out and it might make the mattress a bit easier to inflate on the trail because you could leave it to inflate a bit on it's own before puffing it up the rest of the way.