I have the F1 rigged up inside an old storage building behind our house. I consider it an entry level chrony. I have to use incandescent bulbs as fluorescent bulbs flicker enough to mess it up. If I had it to do over again, I'd get something with remote reading capability as putting the gun down, walking to read the thing after each shot is kind of a pain. The F1's sweet spot is kind of small as well. I nicked one of the uprights once. After that, I put a couple blocks of wood in front of the eyes as I could see a wayward shot wrecking the thing if I got stupid with a shot. I haven't hit the wood with over a 400 rounds, YET. I get an error message about one in 6 shots, most likely from muzzle blast. For the $80.00 I paid for it, I guess you get what you pay for.