How's the toolchain support / dev environment for the Nordic parts these days? I remember the "other" popular chips (TI CC2540 and friends) had a gross and expensive requirement on "IAR Workbench".
Luckily GCC works great with it as it's an ARM Cortex M0. I use the GCC ARM embedded toolchain here and haven't had issues: https://launchpad.net/gcc-arm-embedded The only gotcha is that you need to sign up with an account on Nordic's site to get access to their SDK and libraries, however I'm pretty sure that's just a formality and it's free to sign up (just can't distribute its firmware source, etc).