Bob, I have a large sized BGE and am a huge proponent. It is a kamado type grill and there are other cheaper alternatives as the same there are for Festool tools. I have zero regrets buying one. The great thing about the BGE is that it is very easy to maintain a low-slow cook temperature by regulating the air intake/ outtake vents. Once you get the temperature just right for a slow cook, say 250 degrees, it is very easy to maintain this temperature, just like a kitchen oven. I haven't tried it, but you can actually bake cookies on it. The second great part of the BGE, or any other kamado, is that is uses lump charcoal which is carbonized wood. There is nothing like the taste of meat cooked on a wood fire. As I mentioned before, I have the large size. (18" grill). They make an XL and even an XXL grill but I've read the large size is easiest to regulate the temperature.
Egghead Forum is a good source for ideas and answers.
Edit: I believe those bashing the BGE are like guys in other WW forums saying don't waste your money on Festool, Dewalt is better. I'd also recommend arranging delivery and setup, the large weighs nearly 200 lbs. ---worth the extra coin.