I purchased a used BB, not knowing how long since it had been used. I used it for about two years and the pressure regulator started leaking air, causing the compressor to run continuously. Sent it to BB for repairs and paid about $75. Otherwise, I have have had no problems. Basically, if you have all the parts, including wiring, break-away switch and the compressor runs, stops when it reaches the desired pressure, I'd say you are good to go. That's my $.02 worth.
Roland & Jerri, with Maggie & Mollie, our Pups; '05 Fleetwood Providence, 39' DP; '08 Saturn. "The difference between genius and stupidity is genius has it's limits" (Einstein)