We're really fond of the design of Thermarest self-inflating ground pads for camping, but lately are questioning their durability (lthey seem to reach the point of failing to hold air a lot sooner in their lifetime than one would expect). I'm aware there are other brands of the same style pads, sort of copycats perhaps. Does anyone have any experience or words of wisdom in this area, especially recommendations for or against any particular brand(s)?

Thanks, Gary