Just buy these!
I've tried loads of wheel brushes, eventually using the EZ Wheel Brush and still being a bit disappointed with it. I should have just bit the bullet and bought these to begin with. The problem with the EZ brush (and most others) is that the bristles on the heads are too soft to really get in and clean your wheels properly. The Wheel Woolies don't have bristles and have proper fibre heads, so you can really apply the pressure in the difficult to reach places. My wheels are multi-spoke and 11" wide on the rear so the inner dish is a nightmare to clean...until I bought these.
They're not the cheapest thing, but I've already spent over £40 on other brushes for the simple reason of I thought these were too expensive. Personally, I only need the large (18") and the spoke woolie, as I tend to use a detailing brush where I'd use the small and medium woolies. This might also apply to you and save you a few quid buying all three woolies.