I made the change to a foam tire brush a 18 mo. ago. I installed another 180 degree wall boom on the passenger side bay wall. The foam brush boom swings one way and the tire brush boom swings the other way. It works great. I used a different colored foam brush handle with a round brush head. The foamy tire brush uses less product than the wand did, but my barrels of product get used faster, so more people must use it. Advantages include: getting rid of two check valves in your high pressure line(tire and air), the product gets to the bay quicker, it takes longer to apply and rinse, and you use less product. I think more people use it because they don't have to wait the 5-10 sec. for the product to get to the gun.
I use
JBS's tire cleaner and it foams great, just like the foam brush.
JBS even made me a custom barrel of winter mix foamy tire and it works awesome as well. The last thing I did was to have professional signs custom-made because I couldn't find any generic foam tire brush signs. If anyone needs these signs, I had extra ones made and could get more if needed.