Have the device only once for about 1.5 hours. Tried. The slide projector worked well and the focus is on the common sizes of living room - screens (approximately 1.5 x 1.5 m - more I can not check because I have no greater screen) it was good. The automatic adjustment of sharpness was also good. For the asking price in my opinion a decent device. The price / performance ratio. However, the fan and the slide transport could be a bit quieter.