There's an embarrassing dearth of compelling products, IMHO. Like there's cheap five-channel VHF radios sure, but there's no tiny pocket radios without freebanding a UV-3R, and the two compelling products are niche and expensive:
Garmin has its Group Ride Radio which can be $1500/vehicle all in
and
Dakota Alert has its line of products which I want to play with, but can't justifiably afford until I have my first ham radio that'll do more than five watts.
I'd like to point out that I own a small boatload of Dakota Alert radios, and I'd like to decode their "sensor zone" protocol. Tech support once told me that they operate using modulated CTCSS to identify which of four "zones" is triggered, in addition to playing their voice notification. On the base stations, this triggers a relay which can be used by anybody with a Radio Shack level of electronic engineering skill to do arbitrary things; on the handies, it sets a notification on the LCD.
Still, all the kit is designed specifically to cater to rural users' specific pain-points, and isn't easily applied to suburban folks' situations or interfaced with other makers' kit, despite the apparent and alleged protocol simplicity.
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On the other paw, the Garmin GRR is a nightmare of as-yet-un-reverse-engineered protocol combined with decent hardware and good UI design; if they'd come out with a GMRS version of it, I'd sell my right testicle to outfit my family's vehicles with them. As it is though, each vehicle really needs three freakin' radios, and even if I use the simplest possible radio in each "slot" it's going to be an unbearably complex experience for my ham-flavored ass, let alone the rest of the family.
That was the turning point for me getting my ticket…