I still can't justify 68 dollars for something I'm just using to see if I'll like the switches.
As soon as you'll find a way to justify it, you'll be hooked for good to GeekHack :wink:
Never heard about keyboard loaning, but depending on where you live, you can see if there's some brick and mortar in your vicinity that has some of those keyboards (Adesso, iRocks and the likes, for instance) available to try.
You can also find out if there's some GH members nearby wherever you are, willing to let you run your fingers on their sacred keyboards.
Lastly, you can find online stores with "your money back within x days no question asked" policies, so you could just buy what you need, and if it doesn't appeal to you, you send it back.