oh yeah Dave, the 50k wfrm/s are definitely nice.
I did tested with Tekway/Hantek which have 2500 wfrm/s, result attached (tried to catch the same part as on your Rigol)
Haven't played with persistency, just quick test of "refresh rate"
Btw, the live show "Eva" was my gf (making me crazy), she isn't "blog" fan (actaually she hates my job)
but she like your smile, so what.
EDIT: is did sampled with 4kpts, therefore some dropped frames, with 40ktps the XY seems to be much better.