Got an AiM Solo lap timer, and I'm super stoked to try it out.
I've just been using my Garmin Virb camera for post-track day review. I finally got convinced by enough friends using lap timers to look at the Solo.
What finally got me over the edge was the Solo's predictive lap time feature, which will tell you in real time whether you're faster or slower than your previous best. I consider it the ultimate in being a poseur.