You don't know what the hell you are talking about.
First of all, Radar Roy doesn't sell the Valentine One so do you think it will win any of his radar detector tests?
The Bel STi is $499.95 not $450 like you said.
The Valentine One is the only radar/laser detector with a forward facing radar antenna and a rear facing radar antenna and arrows to actually locate radar and not just beep. Valentine Research has the patent on arrows and multiple antennas facing opposite directions in a single radar/laser detection unit. This is why the Valentine One beats every other detector regardless of brand by 2+ miles in rear radar detection.
The Bel STi has two forward facing antennas, one for X band and one for K and Ka band.
9500ci and STi Radar Antenna Horns - Radar Detector Jammer Forum
The Bel STi is on the right and notice that there is no rear facing antenna.
Notice how the Valentine One has two antennas, one facing forward and one facing to the rear.