I don't know, but I just bought a NeoAir on sale at REI yesterday. If it fails in the first year, you can return it. I have heard of some failures of the NeoAir, but not many. A guy I was riding with two summers ago had a NeoAir burst some internal seams after he fully inflated it and left it in his tent on a hot summer afternoon. Here's how he reported it:
My Thermarest Neo-air popped, more like exploded. I filled it in the evening with usual 60 lung fulls of air. The next morning I left it inside the tent. Thermal expansion caused two of the baffles inside to blow with a loud pop.
The NeoAir has been through a few iterations of technology over the years. I'm not sure which version he had.
By the way, you used the term "self inflating pad" in the subject of this thread. The NeoAir is not self-inflating.