I got one as a Father's Day gift, and i really like it. Not something you use all the time, but really handy when you need it.
It does fantastic with fish, but note the risk as a bad fish cook (or a cook of bad fish) might sour the seasoning on your smoker (and that takes *years* to develop). I've hung ribs in there, and whole chicken too. A small turkey will fit on my 18. It's best, though, for handing strings of peppers... homemade chipotles and adobos, all year long!