What will you be using the keyboard for mainly?
I have a Poker II and I extensively use the arrow keys. It took me around 2 weeks to get to a point where I felt up to speed. So if you're look for a seamless transition then it might be worth skipping over it.
Another thing to keep in mind about the Poker II is that there's no way to disable the Fn + Spacebar combo, which switches the arrow keys to WASD. From time to time, I accidentally hold down the Fn too long, hit the spacebar and then find the cursor jumping around instead of actually typing W, A, S or D.
All in all, though, I love mine and I miss it after typing on a different keyboard.