I was in a similar predicament, perhaps my reasoning will help you. Bear in mind that my experience is limited to two dives, one with neoprene and one with trilaminate drysuit, both of which occurred as a part of a drysuit course. And that all that I write about the Fusion (that I ordered a few days ago) comes from reviews and my speculations.
The price was important and I usually choose something in the middle range; cheap may be just that, pricey ditto (general observation - not targeted at any specific brand). I prefer the feel of trilaminate, without the added neoprene buoyancy, and for now I don't need the extra insulation (temperatures will be down to 15C). The difference of prices for the undergarments is not that high. While I didn't have problems managing the air, I like the idea that the suit is highly elastic and keeps the bubble spread out, while the stiff bladder is very oversized (I have a proportionally largeish ass and when I bend at the waist, the usual cut of one-piece dry- and wetsuits choke me as the shoulders want to slide back).
As for the durability - well it hasn't been years since the first ones came out, so meagre statistics, but again, the idea that you can replace the outer skin, which I suppose is the first to suffer, for a few 100 EUR is attractive. And I read that the inner bladder is very tough, so unless the material deteriorates or creasing in the same places weakens it, it should last.
But mostly, from all the reviews I've read, I can remember a single negative one.
[ADDED:] Disclaimer: not in any way conected to Whites, Scubapro,... not even diving it yet
