I'd buy a new or used one again
The Enclave has its issues which I think I've worked through all of them. My Enclave has 174,000. Yes, it has a transmission pattern failure. The wave plates between the 6 forward gears develop metal fatigue, crack and disintegrate. GM repaired mine at somewhere around 70,000. Yes, the engine has what is called, "direct injection". This leads to build up on the values. Use of the fuel additive, Liquid Molly - 2007 will prevent this. But the Enclave is the quietest, smoothest, most spacious ride I've ever had. I'd buy either a new or used Enclave again.