I got the MXT275 on pre-sale, and did an unboxing and installation video, and have been using it for over a month now. This is an amazing GMRS radio with a decent range. I have little to no interior room in my car, so this was perfect. The control head is attached to a mount that I made out of a ProClipUSA mount, a RAM arm mount, and some ABS plastic sheet.
I initially used this radio with a PCTel unity gain NMO mount antenna, but have since moved on to a Larsen LP450NMO puck, and have seen a jump in performance. Can't recommend this enough.
The only feature I could ask for would be an ignition sense wire, or an ignition status sense that would turn the radio on when the ignition is turned on, as I have mine wired to an ignition-controlled fuse block, and have to turn it on manually every time I start the car.
We upgraded to the MXT275 last month. We have been using our Midland FRS/GMRS handhelds for 2 years between vehicles. However, over the horizon communication was not always possible, and keeping track of a handheld while offroad is not always easy. The MXT275 has increased our range and reception beyond our expectations! The setup on our dash and ease of use of the radio makes this a perfect upgrade. I can highly recommend this setup to anyone!