I got one off Amazon too. Car washes are much more fun now. But for $65, its kinda hard on the wallet for something that's so simple.
I paired mine with a Cleanforce 1800psi electric PW from Home Depot. Works fine. Gas pressure washers would be better, but electric is so convenient.
Btw, I used Megs Gold Class and it works great. You can get the 1 gallon bottle at Costco for $12. A lot cheaper than the Chemical Guys stuff.