I just bought one today, the Sport version with triple blades.
I LOVE it, I've only used it once compared to the two previous times I used a Sensor Excel.
They say that the first couple of times it's got a learning curve, but I didn't cut myself a single time with it. Perfect shave all the way around, and I have a few ugly ass moles I have to concern myself with- which I nearly took them off with the standard razor.
Thus far, it's a MUST for anyone that shaves their head (can probably use it for arms and legs during contest time too), in my opinion.
I also bought the HeadShed lotion with it too, which gives a nice soothing menthol relaxation to the scalp.