Air Bags/Springs - Firestone, Air Lift or?

I've had AirLift bags on '06 F350 drw crew cab since Oct. of '05 right after taking delivery of truck and just before loading new Lance 1181. I went with frame mounted fill valves, both in L rear wheel well,no onboard compressor. I've had zero problems until last February when one started to leak. My local RV service center pushes Firestone but carries both. While trying to decide whether to go Firestone after the long service I'd already got out of the Air Lift, I called Air Lift to get some comparison info. Without asking for a deal or warranty replacement, the Air Lift rep. just asked, "are you the original owner?" When I answered "yes", he replied I'll send you a replacement, just return the old one via the prepaid label I'll include. I couldn't believe it! When I said I'd like to buy a second one to replace the other side so I wouldn't end up with one new and one old, he said he'd send a second as well! Just send both the old back. Bear in mind, these bags had been in service just short of ten years, most of the time supporting my 1181, and they replaced them for a small shipping fee! Any company that stands behind their products like that is getting my business. I carry about 10-15psi when empty and 80-85 when loaded. If we unload the camper (rarely) while camping, I usually carry a bicycle pump to air them up when reloading. Hope this helps you make your decision.