1. Yes, American is one of the historically better performing active fund families often available in 401Ks at preferred terms. GFFFX expenses are low (.42%) so that helps a lot.
2. It looks like a "stealth" index fund - i.e., only slightly deviates from the index and with low expenses and turnover.
3. Don O'Neill is just one of several managers of your fund.
4. According to Morningstar, long-term it has bested the index by just .13% annually and lagged the last year by .35% - that's pretty much a dead heat.
5. S&P is an index, not a fund.