that said, IMO, the 15400 dial is far more spectacular than the jumbo. it's simply 'alive' the way it glistens in the light. whereas the jumbo is much 'calmer' and muted.
went back/forth with 15400 for a long time. but once i had both side-by-side at the boutique, the decision became immediate. after which i very shortly found one for a great deal. originally thought i had to/should get rid of the ROO. IMO, had i decided on the 15400, the ROO would've been more redun