Here's my take: the BGE is a great grill that you can also use to smoke meats and a lot of other stuff.
My original worry is that I would buy a smoker and that it would clog up precious space around my house and not get used. The BGE will get used a lot around here. If it turns out I get into meat smoking, and the BGE doesn't do the job, I can get a dedicated smoker later. In fact I checked out the Traeger that some mentioned in this thread on Saturday.
A few years ago I tried to smoke a brisket on the traditional Weber. It was not easy to do, and did not turn out well. It had to be monitored closely to keep the temp in range, and it did not stay moist. Sure, maybe with experience I could have kept it from getting dried out but it is still difficult to keep a consistent temp with the kettle grills.