Yeah, I too love my Sphere for it's ultimate flexibility: forward, reverse, brushed, and brushless. It's footprint is a tad larger, but doesn't weigh that much at all (0.87 oz). With a custom made connector, its very easy to change between brushed:
An ESC like the Sphere somewhat preserves it's value a little better for the future since brushless racing is inevitable. Right now, you'll find mostly everyone is still racing brushed motors, but many clubs are now racing brushless. This will only gain popularity in the future since they are more efficient and are maintainence free. I bet in a year or 2, you'll see a lot more brushless activity.