Not to rain on anyone's parade, but noticing massive improvements in browsing by enabling pipelining is probably mostly psychological. Pipelining has to be supported on the server side, and there are a great many servers out there that still haven't enabled pipelining. Even if that's in place, the only people likely to experience significant increases in performance are folks on high bandwidth, high latency connections, because all pipelining does is allow multiple requests to be in flight at once - on a low latency connection, the response time will be such that pipelining will make very little difference at all to the bottom line. Try it and see - get a stopwatch and time page loads with and without pipelining enabled, but make sure you clear the cache between runs ;)
Umm, Did you miss the part where it said this was for Broadband users only?