I have had many issues with the Intel Pro/Wireless. My main issue with the card was the issues with Power scrolling. Despite the fact that I disable Powerscrolling, it still lowers the card's power anyways. Also, having three, four applications on your computer for Wireless is also annoying (winzeroconfig.exe, Dell Quicket wifi networking, and intel pro/wireless software).
Likely, Broadcom looked like they were real close to production.
But the switch to Atheros, and their more interesting solution may have been one of the reasons for the switch.
Likely Airport Extreme 2 is around the bend, don't know when Lenovo is planning on shipping their Atheros XSPAN 802.11n machines -- but with their more public news strategies they may be a sign of how close Apple is.