I'm using a Tailgater and it's plenty for almost everything, the only thing I can't fit is a Beer Can Chicken, sitting upright. I'm pretty sure I could fit a decent sized Turkey on the Tailgater, but haven't tried yet. My thought was that a Tailgater would be a good (cheap) start to pellet grills and if I really liked it, I could upgrade to a bigger one. And now, I want to upgrade!
But really, the Tailgater is plenty for my needs.
I'm a Treager fan, but there are other comparable pellet smokers out there that are cheaper.... like Green Mountain Grills and Pit Boss.