Eyelets are supposed to make for more durable wheels by reinforcing the spoke hole, but I believe it depends on how they're done. The MA3, for example, uses single eyelets which actually require a larger hole and can weaken the rim leading to spoke pull through. The Open Pro uses a double eyelet--also known as a socket--so that the both the inside and outside surface of the box section end up supporting the spoke tension. Using stainless sockets also allow you to use aluminum nipples if you're so inclined.

The Deep-V has no eyelets, but it's not really a detriment in practice. They can handle a much higher tension than the Mavics. They are also stronger due to their deeper cross-section (there's no aero benefit for such a low profile though, you have to get quite a bit deeper for that), but heavier.

I really like Open Pros. Strong, light, and wicked easy to build with because they come so true off the peg.