In reply to Taurig: I know at least six people who have owned eVent jackets, from various manufacturers, and for the jackets to leak after three years or less of use. This isn't day-to-day wear, just regular weekend wear in the hills. The jackets have not all been lightweight things: they've included things like a Montane Superfly XT.
I think that eVent is more breathable than Gore (marginally) but is nowhere near as durable as, say, ProShell. My last jacket was eVent, my current one is not. My leaking jacket was actually see-through in places - you could hold it to a strong light and you could see microtears in the membrane: not a good sign. I hope Gore know what they're doing with their latest generation of fabrics, as they are removing the breathability-limiting PU, but that's also what increases their durability, and is one of the crucial differences between it and eVent...