I've done it. It sucks in my opinion....just VERY addicting.
I did it by accident...I was in a car and a guy offered me a bump..so i cut myself a fattie and wacked it down. I assumed it was coke until my nose almost fell off from the burn... and the dude said "holy SHIT..that was meth bro !!" I was up for a while 
I know the exact feeling bro.
I was at my buddies house last weekend after a leg day. I forgot to bring food with me and I was going hypo quick, so he said i could have some chocolate milk. Little did I know this son of a bitch brought me a bottle of Yoohoo instead but I didn't realize it til I'd taken the first sip.
Needless to say we haven't spoken since.