The Intex Camping Mattress is a bargain.  It requires a bit of ingenuity to inflate easily, but once I adapted my little air compressor for the job, inflating became easy and routine (used an inflating pin for a soccer ball and stuck it in an inverted inner top of an eye-moisturizing-drops bottle; the wide end of this soft plastic thingy fits the mattress perfectly).  I've used it on one 5-day camping trip so far.  It is comfortable and firm.  I deflated it every day to conserve space.  Before my trip, I noticed that the mattress loses air after two or three days (one expects this; no big deal).  It's still working fine; the fabric side is grippy enough so that a slippery sleeping bag doesn't slip around, and the bottom side is of heavy enough gauge material that reasonable care will keep it from being punctured.  I'd buy it again.