I have just gotten a GMG Davy Crockett, it is the smallest version of the GMG's units. It's advantages, for us, is its size, it fits into my car's truck, its interior cooking space, I smoked a 16 pound Hen in it without any trouble, and it ability to run on 12 volts. My wife wanted us to be able to cook during natural disasters, should they happen. This unit is 12 volts, comes with a 120 to 12 volt converter. I have hooked it up to my car battery and it ran for the whole cook, 4 hours, without draining the battery to the point that I couldn't start the car.
Temperature control is digital (+/- 5 degree increments) and this small dynamo has done a good job on all the bbq I have thrown at it. Just smoked salmon yesterday, my wife, who loves salmon, was afraid it would be too smokey. After 4 hours at 150 degrees, jumped to 200 degrees for the last hour to finish. Used Alder , the salmon came out with a nice crust and a flavor that my wife loved. Definitely it will be a repeat item for our menu.
I have kicked my DC to 475 degrees, open the direct heat plate and grilled steaks, they came out well. All in all, it is a nice small unit, great for mobility, but, short on space if you are doing a large cook. I have been looking at a Yoder or a Blaz'n Grill. Both units are work horses, both made in the USA. I am leaning in favor of the Blaz'n Grill currently, will be changing out my propane unit this coming year so the quest is on to determine what unit I get for big cooks.
If you want to add extra smoke to your cook, look at smoke tubes or like accessories. Blaz'n Grills makes a nice unit, you can see it in one of their online videos, also, A-MAZE-N-TUBE-SMOKER - 12" will help increase your chamber smoke during cooking.
The choices are many, it comes down to your personal preferences. I would recommend you going for a digital controller. The end game is the meal, you can get that cowboy style over a campfire, all the rest is just having fun.
Newbee