i run it with performer and have to agree it is buggy. lots of processor spikes and lock-ups. i've found workarounds and use it on a daily basis....but sheesh, you'd think focusrite would get it together.
it does sound wonderful and i love having an actual physical controller...so i've learned to live with the bugs. maybe someday i'll try one of their new " beta" fixes but i'm in no rush. i had to uninstall a newer beta that was actually worse than the original beta that came with the product....yikes!