Taken alone it is a wonderful experience. Taken with another person or a group of people you like you like it is an epic experience.
I did it alone when I did it the first time (was too curious, had noone who could trip with me and wanted to test how I would react to it in an environment I am used too) + several other times when I couldn't withstand the temptation of having a roll. Each of this rolls was wonderful for me, I could focus on myself, even just lying on the sofa and listening to music made me the most satisified person on earth at this moment.
But every roll I did alone I noticed how I seek some kind of social interaction, it was pretty hard to sit here and nearly die of happiness and not being able to tell somebody how happy you are actually right now. So thanks to the #bluelighted people and especially Ayla who accompanied some of my rolls and especially my first roll, had an ear for my feelings and supported a very very wonderful night.
Conclusion? Rolling with other people is definitely better, because it adds another layer to the experience. If you are talking to someone who is on MDMA himself, it feels like you would know each other for years. Conversation can get really really intimate (when I rolled with a friend who I know for 22 years now once, we both experienced an astonishing depth in our conversation and we both know ourselves really good!) and that is why it is a truly magic experience imho.
Some people say a roll you do on your own is a waste of material, I think it is also a wonderful experience, but not as wonderful as with a good friend. But I have to say that I am kind of a loner sometimes, I don't have to be accompanied by someone all the time.
tl:dr Try out yourself
PS: A wonderful memory that just comes to my mind. When I was rolling alone some weeks ago I decided to go out. There was a thunderstorm coming up and I found myself dancing to really wonderful music in the woods and watching how the flashes ignited the horizon. I can't forget that picture and what I felt in this moment, still makes me wan't to cry because this was one of the most fucking beautiful sceneries I saw on MDMA.