Arkio, you are probably right about your last sentence, but if your Chinese gear comes from a reputable US importer such as VAS audio for Cayin, then they do stand behind their products. I had a remote controlled that needed to be exchanged - no problems and no questions asked, and all with a smile.
As for Sim Audio, try to find my post in this Audiogon thread, under the name of juaudio:
http://forum.audiogon.com/cgi-bin/fr.pl?cspkr&1144542394&read&keyw&zzdealer
Regretfully, you can probably wipe your's too with Sim's warranty, or at the very least, you should be in for a trying experience should you require any warranty - or respect, as I have, with no results. Beleive me, the fact that a manufacturer is located in North America should not to be taken as an automatic guarantee of good service, when in fact some manufacturers take our good patronage for granted, as Sim Audio did.
My experience is of course, an isolated event...or is it ?