I actually picked up the stuff while I was in London. It certainly looked the part and did the job, although as soon as it felt like the bomb was opening in my stomach I needed to get it out. The burning sensation just felt like all the meph and spilled out from my mouth to stomach and was corroding my inside - no joke, I never had this sort've problem with mephedrone so it is possibly cut, but to the eye it looked okay (I always found it was fairly easy to spot cut mephedrone when it started to appear, but things may have changed).
It is shit anyway, and I'm going to end up making things worse as I'm heading to a Festival this weekend and I'm planning to pick up some cid and trips while bringing my own drink. Been looking forward to this all year, what a shit time to get problems.
When pills pop in my stomach (for example the qDances) it also puts me in a lot of pain once I start to come down a bit. This along with the pains throughout the day make me think that it isn't exactly some problem that will be cured by a course of Omeprazole.
Take this as a warning too, I think I'd heard of this before years ago, but nothing lately.