I give it a strong buy recommendation. You won’t be sorry. I used my CED Bluetooth chrono for a long time and it worked fine, but setting it up and getting the alignment and light correct was a bit of a pain. Then I wanted to try OCW which doesn’t care about velocity but I wanted to track V vs charge weight without re-doing all the shots and it simplified that.
I have the apple app, but it’s antiquated with several bugs and it does drop the Bluetooth connection frequently. They say they’ll update but I’m not sure what’s holding them up, it’s been years. It does work, but use an SD card so you can get your data to a desktop, if that’s your game. Get a battery pack, and I’d recommend a 90 degree USB micro connection for the power input.
I bought mine “on sale” when they drop the price 50$ around Black Friday I think it was. Good luck.