I am with Bob above...I feel I am too old and set in my ways to change the way I play (thumb under). As I understand, this fingering method was mainly designed to allow the best accuracy in playing each note at an equal volume and touch, especially when playing rapidly.
I know it really works well for me.
I suspect the "thumb over" method may be very rare among those on SZ who began their keyboard playing journey on the piano.
Ian
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Yamaha Tyros4, Yamaha MS-60S Powered Monitors(2), Yamaha CS-01, Yamaha TQ-5, Yamaha PSR-S775.