Professional, equipped with latest technology for diagnosis of systems so obviously up to date on training. Used foot-bootie so no mess left behind. Put all the settings back the way they were after performing his tests. Also just got a really good vibe from Rob, sounds silly but with me it's important to trust your gut . Last but not least a van load of salesman did NOT appear on my doorstep trying to sell me stuff like the last 2 different companies I've had experience with.