I have the caldwell chronograph, the last version, not the new inverted looking one.
Works great and has been through a zillion trips to the range. Came with indoor lights, a tripod, and a batter pack for the indoor lights. I wouldn't buy anything else if you wanted an optical chronograph. Mine didn't have bluetooth, but that's okay. It transferred data to my phone via the headphone jack. App for the data was excellent (far better than lab radar's). Then again, I could poop a better app than lab radar created.
However, since I shoot a public range, I swapped over to the Lab Radar for convenience reasons.
I like not needing to stop the line to setup/takedown/adjust the chronograph as well as I like how the lab radar works with any conditions of the sun. Every so often I would have a day at the range spoiled by super bright sunlight at a bad angle that gave me readings of 4-5k fps. Also, after sundown the readings get sketchy.
The lab radar fixes these things. But it also regresses in how you are given data. The Bluetooth connection to my phone is unreliable, after a few strings the app will crash after ever shot. I would prefer if I could just hard wire it to my phone. Also, the App is junk. Very hard to use and I cannot rename my shot strings or add info like the load/powder/etc. All I get is "String 25".
If I were doing it over again, I am not sure I would upgrade. The lack of flexibility and the aggravation of keeping connected to the lab radar makes it a pain to use. I actually find I use a chrono less now because of these issues. So I guess they are worse than having to stop the line to setup/takedown/adjust
If I were able to shoot on my own land, I would use the caldwell all day long. Oh speaking of which, the caldwell lasts forever on one 9V battery.