Is it hard to do those things up? I've always liked the single fold Omega OEM deployant, particularly on Speedmasters and other vintage sports models, but those butterfly clasps look like pretty difficult to get back together one handed.
Not at all. The other side of the clasp is shorter and is a friction closure. The larger is push-button deployment. Additionally, both sides of the clasp have micro-adjusters that are spring loaded, the tips of which are exposed and finger-friendly allowing for on-the-fly adjustments.
Its amazing how a strap can change the look of a watch..