I migt cost a bit more than a GOSM but I have complete comtrol of my Camp Chef Smoke Vault down to as low as 90Â°F and as high as 375Â°F without any problems. Now the coldest it's been since I got it end of April was only about 20Â°F about and I do have a wind screen around it. Haven't tried any really low smoke since it got hot out but I thought I'd just throw a few coals in there with wood chunks instead of using the gas.
NO mods required or needed and there is an optional 5th rack you can buy if you want it. The thermometer is right on to - all you have to do is clean it with a greeny pad after you smoke to keep it accurate.
Also I have gotten an average of 38 to 40 hours on one 20 lb. tank of propane (not included) which seems to be double what I see on some others.
Best price I've seen with free shipping is amazon.comhttp://www.amazon.com/s/ref=sr_pg_2/...smokers&page=2
I'm not sure but Jeff's an afiliate if you click through the forum he might get a stipen. I asked once but never got an answer - worth a try though.