I got my Raspberry Pi 2 a week ago from Amazon. I got tired of waiting for MCM/Element 14 to lower their ridiculous shipping costs.
The rpi2 is much snappier. I’ve never been a big fan of anything but the price point. I like the pcduino series for actual use.
I installed cpuminer (the trick is to install it from the GitHub download; do not clone the repo). The Rpi2 produces about 1.5 khashes/second. The chipset does get very warm to the touch. I’ve seen anecdotal comments that the original Pi could hash less than 0.5 khashes/second.
