For all I know, my ****** 9500ix detector has saved me from at least 10 tickets that I can remember over the course of almost 2 years.
Ranging from knowing an officer is ahead so I can roll down my illegally tinted windows, to speed traps, and red light cameras.
The detector cost me only $500.
Just one speeding ticket, plus consequent insurance rate increase due to my age and that ticket will definitely be more than $500.
Just that one save makes the detector completely worth it to me, so those that have never had it can keep on talking!

---------- Post added at 03:53 PM ---------- Previous post was at 03:50 PM ----------
On the contrary, a jammer is completely illegal in the US.
A laser shifter is not illegal, but it is not worth it to me because a good one is approximately $1000 and all that device is gonna do is attract traffic officers to my car and piss them off.
Leading to unnecessary searches and harassment.