well older radar detectors are crappier....
and with new ones they have the new radar detecting... like POP feature. ive heard thats a new radar to get people that older or cheap radar detectors wont detect till its to late....
and some of the new detectors have a GPS feature to eliminate most false alerts. which is very cool..... it ignores that detected signal at that location. pretty nice option IMO. tho i dont have a new one yet

i want one buy dont want to spend freaken 3-500bucks for one!
i want a radar detector that has some kind of output so i can silent my radio when it gets set off
you can keep an eye out all day long that still isnt fool proof... cops get sneaky... there is bike cops and they hide in the dark shaddows at night....

trying seeing them!!!!!!!! at least a radar will go off to MAYBE warm ya. but it all depends if the cop just keeps his radar gun ON... cause if he waits till ya get close enough and then turns it on YOUR STILL SCREWED..
i dont trust those radar things that say WELL EVEN PAY YOUR TICKET... i dont believe that sh**!!!!!!!
use your best judgement... it wont always save your @ss but typicaly first time it goes off and you slow down in time it can pay for itself. 2 ways.... one the ticket... second insurance rates.