I am long term opiate user... I relapsed all the way down, until methadone. I kept thinking I will quit over twenty years. I had wife and family, but...
Well, I must say, with pot I was nearest zero in relapsing on opiates, but I smoked pot every day... and I still craved.
I tried subutex and suboxone; I never bought those from street; indeed, I hated subutex (which is widely sold here). And I was on suboxone maintenance. But, bupe didn't help me, because I kept using illicit opiates and opioids where-ever I had chance. The thing was, I still craved full agonists in bupe... I never ever got over cravings with buprenorphine; and that was the main problem with it.
Now I have been two years on methadone, and everything is fine. I used last time when my dose was not holding me 24 hours. I like certain drugs still, but I don't have any problems (abusing I mean); and I like drugs from theorethical point of view mostly.
Methadone is fully satisfying to me. And I believe that it is much much better choice to me than buprenorphine