I did exactly the same a couple of months ago, though I still use PC at work: switch to Omnifocus. I loved Netcentric's addon, but I must say: I don't miss it. Omnifocus exceeds all my expectations.

And with it installed on my iPad, iPhone, and syncing everything using spootnik (www.spootnik.net), I got a solution Netcentrics never could offer: access to my GTD system from all my devices.

At work? I use TeamViewer against my iMac at home, and voila! - access to Omnifocus even from my PC at work.