I use generics from a source I trust, but sometimes the pure powder too. I've tried all the big "brands", and there's nothing between them IMO; it's just etizolam sold with a name on the blister, for a significantly higher price.
I wouldn't describe my exp with etizolam as euphoric, just really relaxing without sedation, but it's all subjective really; I've heard loads of people describe the effects as euphoric - to each their own.
For the first time user without a benzo tolerance, I'd start low, around the 2mg mark, maybe lower. Etizolam's supposed to be 10x the strength of diazepam, after all, though of course the effects are pretty distinct.