Does yours have a gentle arc or is it split down the middle like their earlier ergonomic keyboards?
I've got a "Microsoft Comfort Curve 2000" keyboard, the T/G/B/H/N keys are a little bigger and the whole layout is wavy but it's not too bad. Did take me a while to get used to though.
I use random junk passwords so it's more like a mechanical sequence than thinking press U, then lowercase P, etc, so at first I was getting my passwords wrong a lot!
