I'm another who used the Mylan generic (for Climara) and had the same issues - huge, fell off easily, left skin irritation and rashes - and switched to Vivelle. I too have loved the Vivelle Dot; they're convenient, comfortable, so small and clear they're barely visible, and stay stuck on tightly with no fussing. Plus they're *intended* to be changed twice a week, so no arguing with pharmacists about wanting twice as many boxes of patches per month as they expect.
Best of all, when I got my refill this month, the Vivelle is ALSO coming in a generic.

$15 copay instead of $50 for me, and the generic is produced by the same manufacturer who made the originals (Novartis) so it's utterly identical. I think it's because Novartis has come up with "Minivelle" as the replacement that they can charge full price for, so they're willing to make their own generics for the "old" one. Brand-name Climara was supposedly much better than the generic, so this is a huge deal; the generics can be made very badly, apparently.