I have a V1 with remote display in all of my cars, easily worth the money in terms of tickets saved. I can site numerous personal examples where the combination of direction arrows, multiple bogey tracking and range have saved me tickets. Add in their upgrade service and general ease to deal with, it is a no brainer for anyone that spends time above the speed limit.
FWIW, radartest.com has a reputation for being funded by one of the radar detection companies. No idea if it is true but their results do not synch with numerous independent magazine tests. (Note - since all of the detectors companies advertise in the magazines, I would guess you could call them independent.)