I thought I'd add my input on the spear diver wetsuit since we're coming into the winter months up here in Canada. For my first wetsuit ever I think it is pretty awesome.
*First of all I have the 5mm and it feels like a second set of skin. Aside from being a little tight on the junk it is super comfortable.
As for temperature it is fantastic I've spent over 3 hours in 40F degree water and felt comfortable enough to go for longer. My friend who scuba dives said I would need a dry suit for such a thing, but I pretty much almost stay dry in this suit anyways.
Overall I am very happy and Dan's customer support was very good. I will have to wait see how the suit holds up over time. The only thing I could ask for is please make some spear diver gloves! My hands are the only thing aside from my checks that get cold