Yes, Kangen water helps my Crohn's. No it's not a scam. It's widely used in Japanese hospitals. I have a background in medical research. My college pre-medical studies began at 16. There wasn't as much information outside of Japanese on these devices in 2014. (I speak a little Japanese, though I cannot read it.)
It's ionized, negatively charged I believe, highly alkaline, water that microclusters H2O molecules and supposedly absorbs through the GI barrier better. Yes it facilitates a healthier GI tract, however if you have severe scarring, it will make you bloat a little and increase your bowel motility a bit (this affect goes down over time) so you need to have this under control before drinking it and taper up. This is widely used in Japanese hospitals and accepted as effective by Japanese physicians, however it doesn't have massive studies to prove it's efficacy because there is no money in doing those human studies and it very expensive to perform large-scale human studies on anything. There will never be large studies. That said, Japanese physicians are far superior to a lot of Western docs and don't usually prescribe to bad medicine. Even Japanese medical research eclipses a lot of Western countries.
The water will have the same benefit of a healthy diet naturally making your body more alkaline, it just has a shorter shelf-life of a healthy diet. Ideally it should be used with a diet that removes all sugars that doesn't come from fruit and honey or foods that break down into sugar in the body (ALL carbs) to maximize healing. You are not supposed to eat or take medication 30-60 minutes before or after drinking the water (though I've noticed no side-effects doing this) because it affects your digestion a bit and theoretically could speed your medication absorption. There are no studies to support this and it's erring on the side of caution by physicians dealing with sick patients. Many diseases like arthritis and some forms of autism have digestive roots that also greatly benefit from Kangen water, but the water is particularly effective in helping GI disease sufferers heal themselves.