Also anybody have any experience with the Cardo Pak talk bold intercom system?
Yes, been using it for a few years now between myself (in my Talon) and my riding buddy on his dual sport bike. We also use them when we're both on bikes, either street or dirt. They work very well for our purposes, but we normally ride within a half a mile of each other. The units wont always reach that far, especially if we don't have line of sight. Way out in the open, they can reach further with no obstructions. Car to car, they aren't going to work nearly as good as a dedicated radio type of communication, of course, but you will be able to communicate over short distances.
Between rider and passenger, they're great because you don't have to yell to communicate over the engine noise. I also pair it to my phone so I'm able to play music, take/make calls, or receive GPS prompts from my phone. Another great feature of the PackTalk Bold units is the ability to use voice commands instead of fiddling around with buttons or dials on the unit.
My situation is unique in that when I'm using my Cardo in my Talon, it's almost always with riding buddy's on bikes and/or a passenger. They've been very useful for my buddy giving me a heads up about a potential danger, whether it be a car/utv/atv/truck/bike coming around a corner, a rut, a g-out etc.
I like them and use them often mostly in scenarios like I've mentioned. But if you're intending to use them between UTV's, you'll have to be relatively close to each other (they do daisy chain to provide more distance) compared to a dedicated radio system.
Hope this helps and if there's something I haven't covered, feel free to ask.
Edit:
I forgot to add I always use earplugs while using my helmets whether my Cardo is on or not. They're loud enough to overcome the earplugs so you can still hear conversations.