If you are using any browser other than IE and you have a website online, do not D/L IE for MAC. First, you don't want anything that might potentially crash your machine (and that is hard to do on a mac). If you are programming sites on a MAC, save yourself some grief. Buy a used PC or PC Laptop and use it to run IE. Trust me (and why should you?) IE on a PC behaves differently than IE on a MAC. IE on a PC is very touchy about HTML. I had a site that was not getting as many hits as I thought it should so I borrowed my son's PC and the site would not even open. After I chased down a couple of minor errors it finally got to the point where it would open, but it is very intolerant of any HTML faults, no matter how small.
Best:
None
Worst:
Does not work like IE on a PC