It will be x50 in 36 hours - the movement function seems to really open up the tone compared to all other IR loaders - of course, I've only heard demos and haven't tried it myself, but from what I've heard, I have massively high hopes.
1. Import them to the profiler just like normal profiles (the Rig Manager won't do them yet, so you'll have to use a stick).
2. Find a rig you like, and then hold the cabinet button and turn the Browse knob.
3. With the soft buttons above the screen, select User (it might say Local, I'm not in my office right now to check).
4. Browse through a million cab options!
Other good choices include the cabs from the Lasse, Keith Merrow, and Ola packs. There's also a utility on the Kemper download page to make your own KPA cabinets out of impulse response .wavs, so if you have any preferred impulses you can still use them.