Yeah, I was lucky to get a Belltronics STiR+ with laser shifters factory refurb on Ebay for $900. But then paid $1200 to have it professionally installed. While I am a DIY guy and have installed all kinds of things into cars (radars, stereos, dashcams, flux capacitors, other kits and accessories)... they did a great job -- much better than I could have done, so yeah, it's worth it!
And then when I sold my P85+, I had the same shop de-install the radar unit for $400, and re-install it into my newly acquired P85D for $1000, as well as upgrade the laser shifters from the old ZR4 to the newer LSP units for another $600. It's sounds expensive, sure, but a lot less than speeding tickets and especially insurance surcharges. It's also a completely stealth install, which I like. The only thing I miss is the directional arrows from the V1... but I'm not going to upgrade to the Max360ci anytime soon.