I'll start out with the stupid advertising BS that you can ignore and that will pretty much take of a lot of non-sense.
First things first, LASER is you biggest danger. There is NOTHING to detect until he has you in his sights and pulls the trigger. Unfrotunately, it is an instant speed reading and you've been had before the detector even goes off. You might get a warning if he shoots the car in front of you or he shoots you and misses. Laser is ONLY shot from the front or the rear. Concidering the detector is mounted in the front, it is unlikely that "360 degree laser " is much of a selling point. Don't get hung up on it. Nothing you mount on your dash is going to jam laser. If the little thing claims to have laser jamming, don't waste your money on it, it won't work.
Second and probably more common, but easier to detect, is radar. There is X, K, and Ka bands and they all pickup all three. Radar is also only shot from the front or the rear. Picking up the rear radar is a little easier with radar than it is with laser by nature. However, nobody shoots radar from the sides so don't get hung up on 360 degree coverage. There is also nothing you can buy retail that will actively jam a radar gun. It is against federal law for any company to make it and sell it in the united states. There are ones that claim to do it but it is basicly a joke. Do not waste you money on something that claims to jam radar.
There are simplistic ones and there are fancy ones. I for one never saw a point to all the fancy crap. You don't need arrows pointing to where the cop is. He is either in front of you or behind you and as long as it is beeping, slow the hell down. Some have better sensitivity than others. If the radar is on, my $50 cheapo one will pick it up in plenty of time just like the $250 V1 model. This, in my opinion, is not something you should ever spend more than $75 on.