Cheesy - I have a DorkFoods controller that I use for sous vide, love the thing. I use it with whichever vessel is the right size for what I'm cooking - which would be, my small 2 quart crockpot, or my 8 quart roaster oven, or my 22 quart roaster oven.
What I've learned is there is a happy medium between "not long enough" and "too long" but it's a long margin of error, so I usually err on the side going towards "too long" - it depends on the cut though. 140* would be on the high side if it's a steak, I usually do mine at about 125* so I have some room to give it a really good sear and still not overcook it.
Also, I don't like to put much salt in with the stuff if it's gonna sous vide too long, it tends to make the meat mushy otherwise. Just my experience!