I took mine out yesterday (~ 55* at the time and wind 7-10mph) and the simmer control was excellent - surprisingly, really. I had it up about halfway blast to get the first pot boiling (made cappuccino in my snow peak 700) and then while still going, cooked my noodles in the 1L pot (purchased for the same price from REI and got it in within a week).
I have no complaints after the first use but I will be testing again Friday in similar conditions (and will try it this time with no windbreak, which is why I picked it up in the first place - with my BRS knockoff, and with 2 windbreaks, it wouldn't stay lit. YMMV.)
Only difference is in the pots sent with the stove.