I honestly don't know for a fact, but I do know a lot of mechanics and have many friends that use them... all of them go with the V1... I personally used mine for 3 years now and it has worked for me countless times... and about the arrows it might not seam like much, but it is something you are going to notice overtime. The valentine1 also has 2 radar sensors mounted to it, while all others just have one.

For me the V1 is a tried and true product, I don't think cheaper companies can offer a more...refined product... I mean sure it is not bad until proven bad, but why bother being the one to test. When you can purchase a product which is well known to work.

Either way you will likely end up saving money by avoiding tickets and insurance cost increases..

One thing to note as well... These work best for Highway driving as few cops use bands to give tickets in city driving... they just catch by eye and give a ticket for reckless driving not speeding.