Ken at SPAW will not only function test the gun, but will also set it up for your desired performance with a chosen projectile, from what I know.
I have purchased many FX guns from Baker Airguns. Every one of them has been tested to verify proper function before they were shipped, and every one of them has been received working properly. Maybe Donnie will also set up the gun to your requirements if you ask? I did get a 'demo' .30 cal Mav Sniper from Baker, and I think that it may have been tuned and played with by Donnie. Man that gun shoots good, and I haven't done a thing to it.
These days it is tough to limit yourself to one vendor. Utah Airguns has also treated me well, but while I am on the 'outside' and don't see their actual performance, I hear a lot of folks talking about waiting 2-3 months and still not having their new FX. Maybe just because so many folks order from UA (are they the biggest FX dealer in the U.S.?). And while these folks have been waiting, I have been grabbing FX guns as they show up in stock elsewhere. Maybe I don't get my very first choice for color, length or caliber, but these days when I see a gun which is at least close to my desired specification, I grab it. Seems like nothing in our hobby (or elsewhere, for that matter) is becoming more available or less expensive.