I like it very much. I think it would be extremely useful if you would display statistics of previous runs carried on each test case so that:
a. I will be able to see the aggregated performance on many machines (not just my own).
b. I'll be able to see how a test case behaves on different setups (for example, it may yield different results on firefox and on mobile safari).<p>cheers!
(if those stats are available somewhere, sorry, I must have missed them)