I like the new look. Putting the download and upload tests on separate tabs at the top actually helps on the iPad, and probably even more so on an iPhone, as with the old version, the test choices were on one pull down with multiple links to the tests. It was hard to hit the link you wanted with your finger without stretching the display.
The only down side to that change was that the Combined Test now appears only on the Home page as TestMy Bandwidth Now!. When you get to the post test results, you have to go back to the home page to rerun the Combined Test. Not really a big deal though. The benefit on a mobile device of having the separated test tabs at the top is an overriding benefit to that inconvenience, as now you don't actually hit the worng test link. Maybe in the future you could put a copy of the TestMy Bandwidth Now! button on the test results pages.
I haven't checked anything else out yet. So far it's looking good though.