Just thought I'd check on experiences of other with iPhones who have updated to v4.3.1 of iOS.

Still running on v4.2.1 here which is working fine and has been by far the most compatible version of iOS with Mobility. Are there any issues with v4.3.1? As the saying goes "if it ain't broke don't fix it" but getting fed up with the whinging of iTunes about the update being available.