I know that most people would say that they wouldn't do it if they were going to be the first. But in all honesty, if you know that he's an excellent surgeon, if he's got good credentials, is willing to give you good aftercare, and knows what he's doing (Has been proctered in the LapBand procedure, or will have some there who is proctered in it to show him how to do it.) then I would personally go for it.
I don't say to go for it just because it's free, I say to go for it only if the above guidelines are met. I wouldn't say to do it if he will be doing the surgery alone and is not familiar with the procedure, and I wouldn't say do it if he isn't going to be giving you aftercare either. You need to ensure that those things are going to be taking place and set up for you ahead of time, otherwise you may find that you'll regret going ahead with it.
I also advise you not to keep your body in ketosis, and no, we bandsters are not supposed to be eating that way either (with the exception of maybe a week or 2 right before surgery, to shrink the liver so that it doesn't get nicked during surgery). It can be very harmful to keep your body in that state for any extended amount of time.
Whatever your decision, I wish you the best of luck in all of this.