Our one-year waranty recently "expired" .......... so has our Ztwo. It's been in the shop for over 3 weeks now with no "light at the end of the tunnel". Meanwhile, we have lost 3 large customers cuz we did not show up to kill their weeds (acreages). Our unit has been sparingly used, so not many hours on it. Right now, I would return it if I could, but since the warrantee has recently expired, I'm caught between a rock & a hard place. It is at Sprayer Specialties (Grimes, Iowa). They are really busy, yet are trying to solve the problem. So far, they have found 2 wiring probs that were created by the manufacturer. Anybody else have issues with these expensive units?