I use it through multifirmware.
Before I flashed my firmware it would take me like a minute to run a program,
now it's 5 seconds.
I don't think anything crashes anymore with spiv's fix.
The pros are:
fast for loading your favorite programs.
similar to windows.
cons:
when you put a new file on the smc it takes forever to find it.
overall:
not recommended if you haven't flashed your firmware.
And if you haven't, I think you should.