For my 2 cents worth, I think SO is an excellent service. I've only been a subscriber for 5 months, but have had 5 winning months. I love being able to sleep at night knowing that most of my trades are non-directional. The SO system seems very consistent. And I've used a number of option trading systems in the past. I've never been consistent on any of those, and it's not always because they lose money, as much as I can't stomach some of the trades and exit too early and lose money.
To me, the main point I would emphasize on any trading system is to keep your trade sizes consistent. You can lose money even when SO makes money if you oversize the one or two losing trades out of 10. For me, every trade I make Is close to the same size because that's the only way to have consistently winning months/years.