MS4104 does have a point though. Methadone maintenance really does get its bad reputation not because of methadone, but because the people that take it are/were DRUG ADDICTS!
So of course whenever you have a large group of people that did/do take drugs come together, then yeah, you'll see amputee's, canes, missing teeth, obesity, anorexia, you name it. Alot of opiate addicts are poly substance abusers, and a lot of people (at least that I know on MMT) don't use dope anymore, they just shoot/smoke crack and take pills-THIS is what makes them look decrepit. I've also met people that did use methadone as a way to clean there life up, and they didnt look any different than anyone else, granted that they were stabalized on their dosage. However, I believe that even these people who smoke crack and drop 4-bars STILL deserve their dose of methadone, as MMT has made these people's lives a little more stable.
All that being said, don't fuck around with your dose, the high isn't worth fucking up your tolerance, or worth even worrying about fucking up your tolerance.