I purchased a tyredog 4 sensor system for our Simpson / Hay River trip this year. Cost was ~$180 from Ebay out of Taiwan. I permanantly removed the locking rings on the sensors the first time we aired up/down.
On the bad corrugations between Dalhousie and Purni bore all my mags were scored by the sensor bouncing around on the rubber valve stem and one of the retainers on the battery holder broke. Easily fixed with some gaffa tape on the valve stems to restrain them but it would have been nice to have taped them before the corrugations. Oddly enough not a problem on a cruiser where the sensor couldnt hit the rim due to the design of the wheel 
I don't bother putting the sensors on around town which solves the issue of them being stolen and apart from no backlight I ran the head unit on one set of batteries for the whole trip to save having another power cord going to the dash.
The unit did alert me to a staked tyre and has probably paid for itself on this one occasion alone as we stopped and plugged the tyre after it had lost about 10 PSI.
Regards,
Tote
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