I have a big penis. A really, really big one (bet you've all heard this before) and am disappointed with the limitations that only a maximum of 4 contact points provides -- two loops on the penis, one pad on each testicle (didn't realize how important this was going to be), ramp up all the way and that's it? Am new to e-stim in general, but after a few weeks by my calculations I require at least 16 contact points to get where I want to go, although I could live with 14 plus the insertable flange. Thus I will need to acquire three additional units and was not prepared for that expense. Okay. I'm joking about 16 contact points. Mostly. This is a fantastic product, I love it and do not regret the purchase for a moment, but seriously am thinking about creative ways to add a few more contact points. :)