I sous vide in my 10 gallon BIAB rig and temp control can with a heatstick. I made a lovely 2 pound boneless turkey breast a few days ago in about 3 hours. If you can accurately hold a given temp, you can sous vide. It is an eye opener for sure. I also like to do pork tenderloins and 3 lb bottom? round roast beef.
I just did a 7+ pound pork tenderloin in mine. It was tender, and more moist than baked, but not that much better. I was unimpressed.