For me yes it is. The duration with Methadone is awesome can't beat it, it can be pretty euphoric for me to. It's a little more sedating than Oxycodone for me but not as sedating as Morphine or heroin. It doesn't hit you as hard or as fast as Oxycodone to but once you peak you stay on that level for 6-8 hours at least. I love both though my favorite opiates along with morphine.
If you haven't tried it I definitely would recommend giving it a try if your into opiates.
Methadone+cannabis edibles or hash is pretty sweet to. I nod harder / longer than ever. Pretty awesome combo ime.