To clarify some things:
1. Take a look at the back of a new Sony Blu-ray player. 2 prong cord. Take a look at the back of a new Emotiva amp. 2 prong cord--with IEC input. So, it shouldn't automatically be assumed that "3 prong good, 2 prong evil."
2. Like these items, our products are technically double-insulated. There is no single failure that can put AC on the case.
3. If you are serious about your AC power, you should check your house wiring to ensure that it isn't wired in reverse, and that it actually has a ground. You'd be amazed how many homes have problems. We ran into all sorts of crazy stuff in the new Schiit office--test gear acting bizarre, audio analyzers returning bad results--and had to rewire a lot of the outlets to ensure both ground and correct wiring. There are inexpensive testers that detect reversed AC wiring or no ground.
3. The recommendation for cheater plugs is something we've done since the 1980s, in both Sumo and Theta gear. It sounds like these days we should be recommending a GFCI or ground loop isolator instead, so that's what we'll do--we'll revise the manuals to reflect this.
Hope this clears things up.
All the best,