I haven't tried the Igo but since day 1 of receiving my 2.1, I've had an RM2 on it and I'm here to say its un-frigging-believable!! Often after expelling a huge cloud of vapor, I look at my mini in disbelief because I can't believe that huge, tasty fog just came out of that cute little mod. Just thought I'd share... Good luck with whatever you choose.