My Hotline Firefly 5/4 has just got me though my fourth winter, and up here on the east coast the is amazing for a winter wetsuit. It's starting to leak a little around the crotch and knees and i think i'll invest in a new one for the depths of next winter, but i'd imagine it'll last me for several more years as a Autumn/Spring suit which will make my next hotline last even longer!

It's a very simple looking wetsuit, no bells and whistles, it's not the strechyest (??) wetsuit either. but that's why it's so warm. It's flexible enough to move with your body, but not so stretchy that the neoprene becomes "thin."

It's a neck entry system, which means no zips and no leaking when in the water, the built in hood is comfortable when you, and doesn't constrict move too much when worn down, and beleive me you will wear it down even in the depths of winter, the suits really are that warm. 

The best wetsuit i've ever owned, i can't recommend them enough.