I own a Vaquero and many other users on the forum do as well,but the Outlaw for some reason does not grab as much attention,in theory its a good package with 3 coils or what ever the deal is,but performance wise it gets very mixed results,i think its this push button setup that it has,as i have never used one i cannot really say what it is that is not really refined on the detector,it lacks something but the Vaquero is always high on folks performance and all round very good reviews.
Never seen a Outlaw being used in the UK but i have seen a fair few Vaquero detectors,that in my mind is a very good indicator the amount of folks who use these machines.