Works great. It is a bit fiddley to install.
One of our original laser counters bit the dust a few months ago, so I finally got around to buying a replacement pair. It took me an hour to follow the YouTube video instructions (mostly because I kept doubting myself, not normally working with small electronics), but those instructions were complete, and I was able to install the new laser counters successfully. Within minutes after reconnecting it to power I could verify that new data was being reported, with both sensors working properly. If I have to do this again I'm sure I'll be able to do it faster next time. :-) Customer service was also good, with it getting shipped promptly after I placed the order.
Laser Counters
The pair in my Zen unit had drifted apart, but I couldn't tell which was failing as it's hard to compare my village valley's wood stoves with any other place. It appears that blowing compressed air didn't help, nor did I expect it to, so I just ordered a new pair and will play around with really cleaning and investigating the old pair when I have time to connect power and the serial port to my computer or something that makes a good test bed.
Laser Counters