There are two classes of radar detectors to consider. First and only in its class is Adaptiv which is a true motorcycle radar detector, it is waterproof and glove friendly. The second group are automotive, non weather protected units. The big three units that always seem to end up going head to head are BEL, Passport and Valentine. There is a third category that some need to consider and that is for your radar detector to be 'invisible' to police radar detector detectors (RDD) which sniff out vehicles that are using radar detectors. The police RDDs are
real good at this job. Some people would prefer that the police don't know that you are using a radar detector and there are some places where radar detectors are illegal. They are illegal in many parts of Canada, District of Columbia (Washington DC), Virginia and US military bases.
There are lots of tests and reviews, to get a real picture you would need to read a number of test results. Radar detector testing isn't pure science, as the environment changes the test results will vary. This will happen from day to day and location to location so there are no hard, exact results on how one detector works compared to another, but you can find a trend.
This is a typical test comparing the big three -->
TEST
Here is a test of the Adaptiv against a couple of the big name detectors:
(Note that X band is almost never used for police radar anymore)
click the pic
I'm not a V1 arrow person, at least so far. My Passport does show the frequencie(s) assaulting me so I could determine if there was more than one threat. I've never had a real need to know where the threat is coming from to prevent a ticket. Occasionally I would like to spot the cop quickly when my detector goes instantly from 0 bars to 5 bars so I can gauge how likely I am to get a ticket. When hit by instant on radar that strong it's usually too late to do anything about it. I suspect the arrow thing may have to do with the terrain and county type where you live, desert and open country vs wooded, hilly country. Line of sight and opportunities for the police to hide may make arrows more useful in some areas than others.