I bought this thing only 6 weeks ago, tested it once, and now my wife and I are getting separated and I have to move and get rid of it. It's a great unit for anyone who wants to brew inside, the only thing is that it won't plug into a standard outlet. It needs a dedicated 240 volt outlet with minimum 14.6 amp breaker. I had one installed in my garage right next to the breaker box for really cheap, and I have heard of people doing it themselves too (I was scared of getting electricuted so I left it to the pros).
For those who don't know, induction cookers create an oscillating magnetic field that heats up the bottom of the pot, not the cooker itself. If you look online you can find lots of cool videos of people boiling water in a pot that has a piece of paper or a t-shirt between the pot and the cooker. It's pretty cool stuff. Because the unit doesn't actually produce heat, it is very efficient and safe.
This unit is called a "drop-in" because it is meant to be installed into another surface like a countertop or table, with the controller face attached in the front, but it also has rubber feet on the bottom if you want to place it on top of something for testing, etc. I tried it with 5 and 10 gallons and it boiled in about the same amount of time as with gas. Then I put 18 gallons in my 1/2 barrel pot just to see what would happen and it did come to a boil, but took a really long time and I could only maintain a simmer. I would suggest using it for a 5 or 10 gallon batch.
To use induction, you need a pot that is magnetized. You can check your pot by taking a fridge magnet and touching it to the bottom. If it sticks then you are "induction ready." You can also use Reflectix insulation on the outside of your pot to make your boil happen faster, which I didn't figure out until after I tested this thing.
I bought the unit for $600 and I'm asking for $300 or best offer. I still have the original box with all the packaging, the pamphlet that comes with it, and even a Bon Chef product catalog the distributor gave me. It is a really nice unit that is designed for commercial use and I hope someone will buy it and get some use out of it. Let me know if you have any other questions.