I've been using the Cateye double wireless CC300DW, and I'm thrilled. It doesn't sound quite as snazzy as the Mavic with the skewer, but it's working fine. I like that it displays all pertinent info all at once - I was using an older Specialized that I had to hit a button to switch from speed, to cadence, to distance. On the Cateye, I can see speed, cadence, distance, and total time all at once. Today, I just discovered that it indicates whether you're above or below the average speed. I'm loving that feature. It lists for about $149, but I found it at lickbikes.com for $99.