Nothing to complain, just fine - Mountain Hardwear Superbird Ski Insulated Jacket - Men's

I have just received MHW Superbird Insulated Jacket, black, size S. My MHW ghost whisperer s size jacket fit me nice, but for this I was thinking about layering under, then I was wondering should I order M, but decided not to after reading many reviews. It was right decision I guess.
Even though I read many reviews about the volume of insulation saying its insulation is relatively light, it is lighter than I expected.
With just t shirt on, the superbird jacket fits nice. I have just tried layering fleece and ghost whisperer jacket under it, for this review, and it still fits nice. No restriction on arm movement. Reason of layering this much is I will be wearing it in -30 Celsius in extreme occasions, but as it is now almost April, I have no chance to test it until next winter. Without layering, it is probably optimal for -10 Celsius.