Thanks to you I finally understand the difference between RuntimeException and LogicException (the doc and articles I've read so far confused me)! Presenting Frisbee was very entertaining, a pity we couldn't see more of it though (the gif was a bit to fast).
I couldn't hear you very well even though you had a microphone, I think it'd be worth trying to speak up a little bit next time.
Thank you for this talk, it seems analytics talk are very rare and that's a shame! Your talk was very entertaining, the slides well done (nice drawings by the way!), and the live demo was very smooth (by experience I know it's really hard to achieve!). But most of all I think you delivered the message quite well: we can't professionally make claims without proofs, and to get proofs we need to go though those steps you described (make an assumption, measure, analyse the results).
A pity we couldn't see how to set up New Relic and Blackfire, but that would have made the talk much longer I guess. Maybe it could be done in three screenshot slides? I think it would help because I kind of felt those metrics came out of nowhere, even though you explained they came from those tools earlier.