My friend gave me a scoop of 1MR to try today (Old formula with 1,3 DMAA), did an ARM day.
Previous PWOs tried: White Flood, Razor 8, Assault
I guess I'm a bit stim tolerant, the one scoop didn't really affect me too much.
I did find myself being able to get more reps in and being more focused but nothing out of the ordinary.
Took it at 1240 PM, some onset at 1:10.
Tasted alright with 10 oz of water, blue raspberry. Bitter after taste.
Side effect of having a REALLY dry mouth, I was drinking water after each set and still felt dry.
Beat my CGBP personal best however, from 135 x 6 (last time) to 145 x 6.5 assisted last rep.
Managed to do 3 chin-ups with a 20 lb dumbbell between my legs though. 
Weighted dips with 30 lb dumbbell to 5 reps. (Previous 25 x 10)
I got a nice pump but then that's not relevant.
Was it worth trying? Sure.
Would I buy it myself? Probably not. I don't think I'll be fucking with more 1,3 Dimethyl-fuckyourshitup.
No crash as of yet, still feeling normal as when I went to the gym.