Oh yes, I think Erostek are pretty much the gold standard for this type of play although there are others like Zeus and PES that have good reps. Everyone experiences electro play differently but the higher setting on an Erostek can be very intense. We have a 212 (simpler analog unit) and I can't take much past intensity level 3 or 4 out of 10 without secure restraints.

A Domme once plugged the leads from my cock and ball bands into a 212 without realizing it was already turned on with the intensity dial set to max. my hands were secured at my sides and I did the world's faster full sit up! I nearly came off the table!

I think it shocked her nearly as much as me but we had a pretty good laugh about it after she kept saying "Oh My God! I'm so, so sorry!" and I mamaged to assure her I was all right.