I actually rather enjoy methadone. It's not a instant euphoric slap in the face like roxi, but the trade off is a slow come up and a constant great feeling of well-being that will last a few hours(maybe most of the day). I do find however that methadone towards the end makes me kinda tired where as every other opiate/opiod gives me energy, throughout.
Please be very careful with methadone. It has "unusual" properties as far as opiods go. It builds up in your body to create a "time-release", has a very very slow onset to peak(could be as long as 3-5 hrs), and is a pretty powerful substance.
If you are new to methadone READ up on it, understand it's properties, in relation to your tolerance.
Be safe!