I'll talk about one side of the brush at a time.
Wheel brush side:
A huge improvement over the old wheel brush, this one has some really nice rubber edges. No more "clinking" noises while brushing your wheels, and the handle is easier to keep a grip on. The bristles on the wheel brush are slightly more stiff than the old wheel brush, but I thought this helped clean much better. I did notice two or three bristles that got pulled out while brushing, but this may just be expected with a brand new brush.
Tire brush side:
The bristles are extremely stiff. In my opinion, a little too stiff. They clean tires really well but it requires more effort. Maybe the bristles are too long? I may also just be too familiar with using a small, short bristle tire brush.
Practicality of the dual-sided brush:
While using the tire brush side to clean parts of your tires that are closer to the ground, the other side of your brush (the wheel brush) is at risk of coming into contact with the ground. If you have Swisstrax or some other kind of flooring it may not be a huge problem, but outside in my driveway I felt like I was at risk of picking up debris before moving on to the next tire. Just something to think about.
I'm not sure I'd recommend the dual-sided brush or tire brush, but the new single-sided wheel brush is a must-buy!