I disagree with this 95%. The spring drive I had literally kicked the crap out of my cheap quartz watches when it came to accuracy.. The cheap quartz watches aren't as accurate as one may think. Real life example. My GS USA limited edition was at +2 1/2 seconds at the end of 1 month that I owned it. I had a cheap Casio the same month was that +5.. literally double the seconds seconds..Basically the cheapest quartz can give a run for any GS's money. If an F-91W seemingly hasn't ruined mechanical watches' "experience" why a GS should do it?