For a long while I had wanted one of these keyboards but had always shied away from the price. Lucky for me I received one as a gift and have been using it for around two years now. If it ever breaks I would not hesitate to buy a replacement. Simply put the cost is offset by the comfort and speed that this keyboard brings.
The keyboard did take around two weeks to get used to though. Especially the thumb keys and the location of some of the other keys (such as the arrow keys). However, once this teething period was over my speed increased by around 20%.
The only negative is that the keyboard is not portable and has spoiled me to the extent that typing on my laptop has become a real chore. Happily resolved by using a TypeMatrix 2030 as my portable keyboard.