I was looking for a good green laser with auto leveling to replace my old manual leveled red laser unit. While these diffuse lasers aren't as versatile as rotary scanners, this laser should work just fine as long as you're indoors. Forget using them in the sun, albeit without a remote control sensor. This device isn't as versatile as the more expensive ones I've tried, but the price is quite decent. The two vertical lines are the main line expanders, making them brighter than the horizontal line, which uses a circular expander to spread the same amount of laser light over a larger ring. It's not as versatile as the three ring level, but it doesn't cost as much either. This is sufficient for most applications and a brighter light can be useful. In general I am satisfied with the result.