I currently have a Wagner Twin Stroke 9170 I purchased 15 years or so ago. It works but I wasn’t impressed w/ the paint application from day one. I was recommended to try a Titan 440 by a friend of a friend who paints for a living. He said 440’s are easy to rebuild but when I see these used $500 dollar units on craigslist spattered w/ paint I hesitate. Thoughts? Thank you.