Not a radar newbie, but by no means an expert. After two Cobras in high school\college (12 years ago) I stepped up to an E8500 about 4 years ago. I am not a "super speeder" but there is nothing more annoying than the 63 in a 55 or 72 in 65 ticket. After a few of those, you just want some kind of protection!
I also use "trapster" on my Blackberry and update religiously for the others in my area.