Got (in just about 6 days!) the garden hose model, quart size and it greatly exceeds my expectations both in build quality and performance. Our water pressure is probably 'average' 50 psi or so and the amount of foam-using only regular car wash with a bit of water-really has to be seen to be believed. Not what I see in pictures of those using these tools with a pressure washer but really not that much different.

The only negative are the directions/instructions in a word they, blow-big time, BUT one should not have much trouble in figuring things out .

I highly recommend that those who do not have one to get one as soon as you are able-but remember my water pressure is about 50 psi.