Lidar is very common in DE. My dept uses all Laser except for our traffic unit which has one Stalker radar unit that they use in their unmarked car when they can't ride on motorcycles. Most of the other depts around here have both Lidar and Stalker units with them at all times.
I always say that I wouldn't spend a fortune on a detector, but if it saves you one time I guess it has paid for itself. Like everyone else has said your detector for Laser is only going to tell you when you are busted if it goes off at all.
As far as these shifters or jammers. I personally have never run across a car I couldn't clock as long as I saw them with enough time to get the laser on them. Just remember this: A detector, jammer, or otherwise is only going to help if you are close to the speed limit. If you do get an alert you are only going to have a short amount of time to get slowed down. If you have a jammer or shifter and you are going well in excess of the speed limit, I can still pull you over and will be able to articulate a violation. For example if you are buzzin' down the road at 80+ in a 55 I will be able to cite you for unsafe or unreasonable speed even if I don't get a reading.
Drive carefully and try to keep it close to the limit
Be nice to your officers cause ya never know-- they may be a Camaro fanatic like you are.