Summary: After about 4 hours on the bulb, it started shutting off the picture, kicking the fan to high, and LED started blinking error codes. After 4th shutdown in a row, each after about 10-15 min of viewing. I issued an RMA.
Pros: Superb picture/contrast/color quality right out of the box. Super quiet with High Alt Mode off.
Cons: If you live over 4900ft you are supposed to use High Altitude Mode to help keep the lamp cool in the thinner air. High Alt turns the unit from a whisper quiet delight to a loud and annoying disturbance. I wouldn't consider the fan noise in high as tolerable or acceptable. I had it ceiling mounted...
Summary: I've had my unit for just over two months now. It shipped with a defective remote. I contacted Vivitek and they ignored me for a while. Eventually, I was given authorization to return the remote. They've had my remote for 5 weeks and have yet to ship a replacement even after several emails.