I own both, sort of. I loaned out my V3 but can't remember who I loaned it to because it was loaned out so long ago. I use the Labradar the majority of my time at the range when I am doing precision work. It functions well and is easy to use. I do have problems with other shooters affecting it from time to time but that is one of the few problems with it and there are rarely other shooters at my range. One thing to watch out for though, is the Labradar is susceptible to wind. I have had to quit a few times when I noticed gust rocking the unit on the shooting bench. I have read online that others have had their unit break and not function after being tipped over in the wind. For what they cost, I try to avoid impact testing mine in that manner.