Compressor life expactacy

I get about 12,000 hours on the compressors inside all 3 of my Everflo concentrators before they die. Is there other brands that lasted longer for you before they needed a compressor or sieve bed? I see 35,000-50,000 medical grade compressors on the market, is anybody putting better, longer lasting compressors in O2 machines? How long is the original compressor lasting in other brands?