I bought 1 from harbor freight very early on. It looks very much like the rockler one.
I used it only once. My inexperience showed (never sprayed before at that time).
My feeling is it was really noisy and turned hot. It has been sitting on the shelf for the last 4 years in a box.
I purchased the Fuji Q4 gold last year. Much more expenseive but definitely a pleasure to work with, a jewel in my opinion.
Abbas, Castro Valley, CA