I don't find the Methylone crash to be nasty, just stimmy, which I don't mind and kind of like.... perhaps the tons of NO2 I do along with it tends to make me feel better, I dunno. Cigarette consumption (boosting dopamine?) seems to make me feel great through all phases of Methylone, so perhaps that's a factor as well.
I've only ever done it at home on the couch, and the floaty, tingly euphoria seems to me a stay-at-home drug, but I think alot of people like it out in club/social/music settings. It used to be sold in EU in liquid vials called "Ease" which I think alot of people did while out partying, so I'd guess you'll find it nice. But I would strongly suggest you do it on its own at home to see how you react to it, without the addative. Oh wait, you said you finally tried it on its own recently, right? Well anyway, I would recommend giving the combo a try at home FIRST. I think any unknown combo out in any public setting has too much risk of an undesired reaction, possibly spoiling your time at the show, and maybe also that of those nearby you as well if you should freak or puke or whatever, you know? Always be VERY well acquainted in private with any drug or combo you intend on doing out in public in a crowd... common sense, right?