I have owned a LabRadar for about 2 years now and will share a few tips that I have learned.
First it is a giant leap forward in the Chrono world. I find because of its simplicity I use it almost every time I shoot and the data is very valuable to me. I have learned that with Lithium batteries they last much longer and I no longer have the battery issues I had with Alkaline batteries. They will go several shooting sessions without replacement.
Aiming the unit at the target is crucial and I would recommend one of aftermarket sights. I have thought about how i could mount a cheap scope that we all have lying around to the LabRadar.
How you set it up will determine how well it preforms for you. How long you leave it armed between shots will determine how long the batteries last. As others have suggested I would use a battery pack. If aimed properly it will pick up a .224 at 4000 FPS. Also you have to change settings from pistol to rifle or you will not get a reading. I have found that every time I did not get a reading it was because I had knocked it off target or a setting I had not changed.
A old laptop case works great for carrying and storing the LabRadar, accessories and targets.
the App is also a huge step forward and really brought the LabRadar into its own, it also allows you to have the data to use latter without having to print it from the LabRadar.
I find it to be an invaluable tool for developing loads for LR shooting. The more I chrono loads the more I learn.