I have an iQue110, prior to last Saturday night I haven't used it in probably a year. It's not really necessary with an egg. My gasket is leaking pretty bad these days though so my overnight cooks haven't been as steady as usual so I gave it a shot. It held 225* for 14 hours straight. So if you really want a controller for your egg and don't want to spend a ton of money the iQue might be the ticket for you.
"I can get a good look at a T-bone by sticking my head up a bull's a$$, but I'd rather take a butcher's word for it". - Tommy Callahan III
XL Big Green Egg, 22.5 Weber OTS, WSJ Gold/Mini WSM, 18" & 22" WSM, UDS "No.8"
Flyers Orange Thermapen
Napkin Killers BBQ