Using with a WXP3400 and it works flawlessly. I wanted to pay the extra for an all metal assembly as opposed to plastic and it was well worth the money.
Using a Simpson gas 2800 psi pressure washer, surface cleaner worked much better than I thought it would. Liked it so much I am purchasing another one for my father-in-law. I'm sure it would be even better if I had a 4400 Psi pressure washer. Very Please!