I have had one for about a month now and have mixed emotions. It is a single receiver radio, so you can't listen to both bands at one time. I've used it for regular FM and Fusion in both analog (FM) and digital through old antiquated obsolete FM repeaters and brand spanking new Fusion repeaters. I haven't found much value in Fusion so far, mostly due to how the local repeaters are configured.
Programming it through the front panel isn't nearly as difficult as a Boo-Fang. It has two banks of 500 memories, one bank for the A band and one bank for the B band, and they're NOT shared. It does display both the memory name and the frequency simultaneously, which is nice. The scan is pretty fast.
If you're planning on doing digital voice through a repeater, there are some things to keep in mind. The radio receives either digital or analog all the time, but you have to configure it to transmit the way you want. It took me a little while to really understand the settings. I haven't played with any of the pure data capabilities such as sending images, because I can't find anybody else around that can play.
I'd be happy to go into a Fusion discussion as deeply as you'd like.
Bottom line: the FTM-100DR is a nice, VERY small radio with very good audio on both send and receive. If you exclude the Fusion functionality, it's a lot like the Kenwood. I use mine mainly for APRS because it has the built in GPS receiver, but that's a whole other topic.
Here's my happy little one on the dash of the Nissan Frontier. The control head is really small, and easy to find a place for. The display is bright enough to see even in strong sunlight.