Subutex is a great stuff, being on it since few years now...
An addict or an alcoholic can't use any drugs. Period. You're either sober or you're not. If you're doing xanax you will be off and running again in no time. I've seen it hundreds of times.
If i can give my humble experience, i'm on 5 milligrams of Subutex since few years after a one/one and half year problem with heroin long time ago... 5 mg of Subutex aren't shit, i never wanted to dope ever again, and i got off heroin by myself because i got tired of spending money for few minutes of paradise and days of hell... But yes, many are on classic drugs and those products in intervals, never able to go completely off, most of the time...