I have the older SITKA version of their heated vest. It has since been recalled but I refuse to send it back for a refund. It has become a valuable tool when sitting on long cold hunts.
My only complaint would be battery duration if you have it on a high setting. You only get about 2 hours on high but more like 4-5 hours on a low setting.
What I have found out that extends that duration is to wear the vest just over say a T shirt and then put another layer on top of that. The outer layer tends to hold that heat in near your core and this keeps you warmer. Wearing it as an outer layer just lets the heat escape and does not hold it in for warmth.
I have used my SITKA Dutch Oven vest down to single digits and stayed warm. I am headed to northern Canada in May and I can assure you that it will be packed for the trip.
If you wear it as an inner layer then it really doesnt matter what color it is.
Good luck with your choices.