We had two of these suits on test, with thanks to Lyon and Hitch n Hike. They are not PVC.
We were fortunate that we fitted perfectly the two suits that were offered. However, I've no idea on the finished sizing that has hit the shops.
When new, these suits are fantastic to wear. One friend describing them as being like wearing silk pyjamas. Certainly I was very comfortable in mine and liked the slight stretch the material offers.
It is worth remembering that wear and tear will very much depend on how and where the suit is used. I know cavers who are still using Petzl PVC yellow suit which hasn't been around for more than a decade. Others can trash a new suit (of any kind) in just a few months.
We used these suits for exploring a new cave and there were quite a number of sharp projections. Unfortunately both suits were trashed in twelve trips. My assessment is that they puncture easily. They do not, however, rip very easily. So any flake, spike, crystal etc will make a hole in the suit but it will not spread as a rip. In comparison to a Meander I would say that the Lyon suit punctures more easily, but unlike a Meander it will not then tear. Meander suits are more resistant in respect of a puncture, but often once punctured will then go on to create a big tear. I cannot emphasise enough that we used them in a very 'sharp' cave, although in that cave, Meander suits faired much better. My suit now has 20-30 inch long holes in all parts of the suit and a completely shredded area in the backside.
As far as I know Lyon has not offered any advice regarding repair and the new suits do not come with repair kits. My caving mate tried five different glues before finding one that stuck (a Howdens kitchen contact adhesive I think). We had no spare material so he used bicycle inner tube which did the job.
Lyon will need to address the repair issue soon but I think the suit has the potential for taking over from the Meander as the 'de facto' suit for cold, wet, muddy UK caving. Not that there is much choice and cavers will need to dig a little deeper in their pockets for it, as well as their caves.