It was the chord recognition part that appealed to me. I've played bass for almost 30 years, and a teeny bit of guitar off and on, but ukulele is my first major foray into chords. At one point in the past, when I was in college, I could figure out chords by ear on guitar fairly well, but that was a long time ago. Some of the chord shapes on uke are really different. Learning where the root note is in the chord shape is particularly tricky for me (as a bass player, I am used to it being on the lowest string!). I haven't gotten the chords down well enough to always be able to tell by ear if a chord is a 7th, 9th, Diminished, etc. And the uke music I am most interested in uses a LOT of those sorts of chords.