Compared to my other thermostatically controlled device (the stoker), the only thing I can say about the FEC in comparison is the lack of built-in remote monitoring capability. You really don't need it at all though, as you can count on the FEC keeping steady temps throughout the cook time and time again, but at a comp I like to know where my temps are at all times even if they are perfect.
On the other hand, this is easily rectified by using a Maverick ET-73, or even better, what I have started doing, is using the Stoker to montior the temps inside my FEC. The Maverick will give you an effective range of 80 feet (unless you are in a trailer and that range is easily cut in half), and the Stoker will let you monitor from your cell phone within the range of the router you have the stoker hooked up to. Mine is close to 40 yards
Overall, you cannot beat the consistency or the convenience of the FEC. That is, as long as you have a dependable power supply.