05Sleeper- Heh heh, I'll wager the "you don't need a rotary" comments are coming from people who don't own Audis

All it takes is *one* careless wash and the hard Spies Hecker clear is marred beyond what a PC can fix. Been there countless times, and I don't mean just six or eight

It's all a matter of how close to truly flawless you want it to be. You can get one very nice with a PC/Cyclo, but it won't be *perfect*. With a rotary, you'll get a look you've never seen before.
The only way I can get a flawless finish on a marred Audi is by rotary. I've spent an entire day (speed 6, many wool pads before switching to foam, almost an entire bottle of PI-II FCRC) on a silver Audi and I couldn't get it perfect- period. If hours on end (over four hours on the trunk lid alone) won't get the marring out (completely) then it simply isn't coming out in a reasonable amount of time. Even the Cyclo won't give the results I get with the rotary. I've been polishing Audis since the early '90s and if you could get 'em perfect without a rotary I'd have done it by now. There's always something that'll show up under certain lighting. With the rotary, I can get it so it looks great under *any* lighting, even under magnification.
Using the rotary isn't all that tricky. The most common problem is holograms and as long as you don't do something weird they'll come right out with at PC/Cyclo. I hadn't used one in over 20 years but I took it out of the box and used it on my beloved S8 with no problems at all. I do follow up my rotary work with the Cyclo, but for the actual *correction*, the rotary is the way to go. Just use common sense, know when to say "good enough", and take your time and you should do fine.
In my experience, Audis call for a rotary. But tape off the clear anodized aluminum trim.