A search on here would've pulled up a specific thread on the issue.
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Theoretically, the MPH could block MDMA's effects at NE and DA, 'reducing' the roll. However, most people report additive stimulation instead. I don't quite see why that'd be desirable though.
I've down Ritalin and MDMA, although the amounts of Ritalin where very small. I enjoy it, I wouldn't say I noticed the MDMA being subdued. On the contrary, the Ritalin seemed to have added some energy and 'initiative' to the experience.
Although, I am one of those people that like around 5-10mg of speed with my roll. I just find I am more into dancing and talking with random people with the speed. On just MDMA, I still dance, but with less energy and I tend to just get a lovey dovey with my friends.
I've done it, but not while I was peaking on the MDMA. I've done it on the comedown so that I'm not as tired if I'm in a spot where I have to be up such as school or a dance or party. When I'm coming down, my mind is tired but my body is up and about. When I do ritalin on the comedown, it SWITCHES it around. My mind becomes awake but my body gets tired lol