We have been using 8.2.4 for over a month and it is usable. Speed an issue and worse with e-prescribing but certainly not too slow to be usable.
We did upgrade our server to an i7 machine when we upgraded.
Like new features like the spelling check that is on all the time, but had to get used to doing Shift right click for templates.
The ability to have multiple pharmacy preferences is also nice
Greg