I haven't measured my speed with it, but I am guessing around 40 wpm, very smooth and consistent. My hand does not get tired, but that's probably because I'm not pushing it. I don't use it very often, but it always gives me a chuckle. Most of the time, I plunk one of the Realforces on top of a laptop or just behind it and cruise at 80-130 wpm, depending on level of commitment and caffeine.
[EDIT]: Yes, frogpad is a chording device. The common letters (ETAOIN SHRDLU) are single key-presses. Common sequences (THE...) are natural finger strums. The next most common are very easy chords with the thumb pressing down what amounts to a shift key. Very easy, well thought-out, natural, and fun.