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I recently replaced my Thermoprene with Thermaxx. I also agree it's worth it. It is much easier to get into wet or dry.
The big surprise for me was its buoyancy. I had my old wet suit for 6 - 7 years. The first time I used the new Thermaxx I had to add 4 pounds of weight in order to descend. I have a 5 mm and use it even in the warmest water. I tend to get cold at depth. I'm hoping once it breaks in a bit I can remove the added the weight.
Aside from the extra weight I love it.