Yes I have one and like it a lot. Ideal for the RV and truckers. Lots of features.
I've used the voice command lots and it works great always recognizing my voice.
Big screen is nice except when I used it in my little daily driver without tinted windows at night the screen was hard to see from the glare of cars behind me. I've since used it several times in the Silverado where I didn't have any glare problems.
So far I've only used the trucking mode because I like to use the fuel log which is only available in the trucking mode. So I can't review it in RV mode.
Another issue I had with it was it will warn you about sharp curves ahead but the darn thing warned me on EVERY curve with the annoying beep... That can be turned off which I did...
I've only so far used the Dezl in Canada where the dealer I bought it from said the maps and warnings (IE low bridge warnings) are more accurate in the US which I believe.... Could explain the sharp curve issue I have with it.