ARB compressor; had it for 4 years; I have an air locker in the 10-bolt rear; the big O-ring that seals the little air tank at the compressor was leaking twice, so I had to replace it, and some silicone grease helped, too. In hot weather, I wouldn't count on the ARB compressor to fill up your tires: I had mounted the air chuck, but even with 32's, it took forever from 24psi to 30psi, and the little compressor got so hot you could cook burritos on it in absolutely no time. So in my experience, the ARB locker operation was trouble-free, even with the leak at the compressor (only consequence was that the compressor was kicking in more frequently); I'd say forget using the compressor for anything else - I for one don't want to take the risk and burn up the compressor and then not being able to lock the axle anymore.