I've tried some eVent jackets for a variety of activities like jogging, walking, hiking and sports.
I do agree it is more breathable that Goretex while maintaining the same waterproofness, however, it is not the end-all to jackets. It will let water vapor pass through its porous membrane much faster than Gore, due to the lack of a complete PU coating over the membrane. But, that said, we're only talking about water vapor: the sweat has been sitting against your body/in your liner, waiting for your body to heat it up so it can become vapor and pass the membrane. Any liquid water--the sweat beading up against your skin and the jacket--will pass incredibly slow by solid state diffusion through the membrane. In addition, with complete windproofness, you're going to lack the the air sweeping away the moisture.
That being said, if you're looking for a Waterproof jacket, get eVent, because it is the best right now and a good increase over Goretex. Just know that physically exerting activity will still give you that clammy, wet feeling in your jacket, albeit a little bit after Goretex would have.
While I've heard rumors that the eVent jacket--with its oleophobic membrane rather than PU coating--isn't as durable and is more susceptible to dirt/oil ruining the membrane, I've not seen nor experienced anything to give me or others that impression.