I really can't think of anything good to say about this keyboard. I've used keyboards like this, and I've damaged my body with them. You know what matters a lot more than a backlight? Ergonomic design. Get a Kinesis Advantage instead.
As someone who has suffered from RSI, my advice is to not fix a problem you don't have. I've been there, and it just cost me money. In my case, I didn't need a curved keyboard or a split keyboard, those things ended up in the cupboard. I just had to get rid of the numpad to change my position from awkward to healthy. So, for me, this keyboard is actually interesting, the variant without the numpad that is.
I have it at the office and it's just amazing.