The smoke flavor is lighter than an offset or a vertical like a Backwoods or similar, but as Tim said, a lot of people and judges like it. I've been using an FEC-100 for four years and a Memphis Pro for two years and love them both. I also had a chance to taste food from a Jambo pit recently and I was surprised at how similar it was to the food from my FEC-100. I think the fire in the FEC and the Jambo burns so cleanly that you get a lighter, cleaner smoke.
But, the best thing is for you to try it yourself. Maybe you can find a Brethren member near you who will let you come by and taste the food off of a pellet smoker. That way you can tell for yourself.