ive rolled by myself many times and while its fun, i would rather roll with my friends. If you have the self control to save it, then save it. I guess if you roll often and got extra/leftover mdma and have nothing to do for the night then go for it, but I would NOT want to roll for my first time by myself. When i roll by myself, its fun for a bit, but eventually i want to get up and do something and be around people. In contrast, sometimes when I roll with a bunch of people I get the urge to just plug my headphones in and zone out by myself.