We've been looking at Windows browsers, and in an update to my previous post, I said I was going to try Maxthon. Having installed it, I've discovered it's one I tried before: it used to be called MyIE2!
My first impressions are favourable. It's certainly very fast, and feels faster than IE. It has tabbed browsing and recognises a couple of mouse gestures, if that's what you want. It picked up all my Favorites etc.
Last time round with MyIE, I uninstalled this browser the same day (not uncommon in my job -- I often try three or four utilities a day). This time it's survived overnight, so I'm going to keep using it and see how it goes....