I saw that system on Craigslist this morning, nice score!
I have the Fuji Q4 myself, although mine is blue. So far I have only sprayed waterbased lacquer, wb shellac, and regular shellac through it. Overall I will say it has been excellent. The adjustments (spray pattern, flow, etc) are different than the previous gun I had so it took a bit of getting used to, but I can say I have been quite happy with its performance so far. I bought all the needles with mine, but have yet to use anything but the number 4 as it has been more than sufficient.
A couple of recommendations if it didn't come with it.
Get the mini cups. It is a set of 3 small finish containers instead of using the quart cup. Easier to do smaller stuff with and they come with lids.
Get the whip hose. The main hose is stiff and can be problematic for swinging around and such. The whip hose is just a light 6 foot piece of hose that makes it easier to maneuver.
Get some Target coatings USL. You won't regret it.