Pretty smooth. I decided not to buy the "international plug" I just rewired the inside of the unit. I removed the 14/2 cord that came with the unit, and replaced it with 14/3. I wired the actual pid back up to 120vac, and rewired the triac mounted inside for 240vac. I kept the "smoke generator" plug at 120 also, but I wont be using it. My controller will be used just for my smoker, but you will need to note, or mark the rewired output so that someone else does not plug a regular nema 5-15 (120vac) plug into it, because it will blow what ever you plug into it most likely. Mine is mounted permanently to my smoker, so I wont have to worry about it. The 14/2 cord that came with the unit runs (1) 120vac leg and and a neutral & ground into the unit, the 14/3 runs (2) 120 legs-giving you 240vac a neutral and ground into unit. There is not SSR inside like the one you would buy off the web site, but the the guts are the same. The opto isolator is actually mounted on the control board and the triac mounted separate. The triac is rated at 25 amps, #14 wire is good for 15A, my 2400watt element only draws approx 11 A. So I'm good. Not sure how the other guy blew his 20a fuse, must have done something wrong. Also the triac in side is good up to 247 degrees Fahrenheit with out a bigger heat sink or fan, Mine unit never got over 80 degrees. Ive used her five times now, all between 8 & 10 hour smokes. If your not handy with soldering small wires etc I wouldnt try it, Ive been working on big screen tvs and the like for over 15 yrs so it was like tying my shoes. Also I did half to modiy the back panel, drill out holes bigger..