got this jacket of SAC for 89. i am relatively happy with it at that price point. would not pay the 185 full retail. It is warm enough as a mid-layer, but not as warm as a circumferencially insulated jacket would be. without the polyester/elastane sides, i feel it would be much warmer, but they vent pretty well if you plan on wearing this thing on the move. wore it down into the windy 20s (windchill in the single digits) as a mid layer (1 of 4 layers total) and was not cold. 6'3" 220, and fit a midweight long sleeve icebreaker and a midweight merino halfzip under with a windstopper softshell over with no problems. i will say like others have said, that it does not seem up to the material quality that i am used to getting from Mountain Hardwear; just a gut feeling...its not falling apart or anything and has no scuffs or snags in a couple outings. Got the XL.
overall impression: the Zonal is a decent, lightweight, compressible, insulated jacket for mildly to moderately cold temperatures. is it worth 90 chucks? probably. is it worth 185? no. would i use this as a winter alpine layer? no.