I bought two SF30/C rangefinders for a UAV terrain-following application. I had a bit of difficulty with the serial interface, which seemed to have been updated without a concurrent documentation release. The engineer quickly confirmed this (the documentation came out shortly after) and provided a firmware update with the configuration I needed the next day. The devices themselves work perfectly. Accurate, reliable, easy to use. (I'm communicating with them over serial via a Teensy 3.2 using the sync interrupt.)

I used two of these rangefinders on a research project where it was moved around quickly over a large area and measured distance to the walls. I looked all over the internet and could not find anything remotely close to the performance of this unit. When I had questions, the factory responded promptly and helped me understand some of the subtle points of laser distance measurement. This product has been trouble free and very reliable for 20 months of use. I recommend it and the company.