My only experience with opiates of any kind is with Subutex and i enjoy it quite bit despite this lack of euphoria which even to me is notable. I obtained about 10 of the 8mg pills a while back and just crushed them all up and did tiny bumps which gave a nice relaxing high, bit of speed like talkativeness, and what i suppose was slight nodding effect. Unfortunate i never got as high after the first time due to tolerance, with any amount. It seems like once i got to a certain point no matter how much more i did there was no extra effect. As people have said even with small amounts there can be nausea, and everyone else who has tried it with me has had it in some way or another. But after the first time it doesn't seem as bad, and after a couple of times you can seem to handle bigger lines (this is even days after it has cleared out of the system).
I think this could be popular in the UK if it ever gets more easy to find as there is not any 'lighter' opiates than heroin readily available, obviously that coming with huge social stigma. Subutex to me doesn't even seem particularly addictive, even with the amount i had i wasnt too bothered just to wait for some occasion rather than just day in day out. Overall its one of my new favourite drugs since the lack of any negative side effects compared to the alternatives i could do such as speed. The only weird thing is every time on the day after i seem to get some strange lucid dreams i think they are called, i think something to do with the vastly deeper sleep it seems to put me in than normal.