I had Sonic fiber for a while. The speeds definitely weren't consistent -- max downloads would suffer (but still be much faster than non-fiber offerings) during peak hours. Plus they still don't offer native IPv6, static IP addresses (they reneged on that), or reverse DNS with fiber (their ADSL offering still does). If all you're doing is "surfing the web" that's probably not a big deal. But it is a step down from the Sonic of yesteryear that was targeted at power users and had excellent customer support.