Radar Jammers are illegal in the two Provinces I live in, in Canada, but laser jammers are legal.
I too ran a Valentine radar/laser detector for a long time, the original Valentine one, and then more recently the later/newer 2nd gen of that unit. It was/is excellent. I bought my first one from Valentine's one page add in Car and Drive circa late 1990s. The owner/creator had worked for Cinc. Microwave for years IIRC, then left to do it "better", and he did IMO for a long time. I know that if you have the original V1 detector that the company will upgrade it to the new unit for a much reduced cost.
Now running Escort again after using the battery operated Passport way back in the early 90s, the last time I had used Cincinnati Microwave products. Primarily because the Escort installed laser shifter needs a compatible detector, and their own 360 installed unit seems to work out best. I have a portable 360 I use in our other vehicles, but our main highway car has the installed units in it. Not cheap, close to $2.5k CAD after install, but the company that did it only took a day, and they have the laser and radar guns both the city and highway L/E use in these parts for testing purposes, and I've seen it first hand jam the laser, and give pretty decent long range warning on the radar. That said, the very newest laser guns some of the dedicated traffic units are using here give a "jam" warning when they get jammed, and they can have less than great sense of humor about the subject should you jam them. My system has a kill switch for the jammer built in for this purpose, no sense getting pulled over in the well known ticketing areas if you're not speeding in them, while the jammer stills gives the "jam" warning on the L/E laser gun. The rest of the time I leave it enabled, and it works very well. Really only vulnerable to instant on radar, which isn't used very frequently in my areas of travel, I haven't seen it being used in years.
Don't really speed much (too much), despite the wide open and flat/straight roads in much of Western Canada, but the flow of regular traffic on the highway I drive North/South is usually 125km/hr, 15 over posted, if not faster, so I have my detectors/etc just to prevent that random event of being the one person picked out of the crowd, plus my vehicle I have my installed units in isn't going to get a lot of sympathy votes from L/E either.
edit - DurrD, interesting post, your attitude about speeding should be commended IMO. Hadn't considered how dangerous Waze could be to officers safety, things are different up here, with a bit lower threat level in that regard. Still, your policy of monitoring your own L/E vehicle on Waze, then getting off the X once someone has made your location, should be made SOP IMO everywhere.