I've had a play with those clasps. They are quite nice but quite agricultural compared to the ones I have on my high end watches. The Rolex one is a thing of beauty.
No complaints from me though, I'd rather have one of those than not if you see what I mean.
The only thing I have found online is a video where he keeps fully extending and contracting it, which makes it really hard to tell if it would give micro adjustment.
The downsides of that strap vs the regular is the extra chunk of the clasp and the price.
The Seiko Sbdx001 clasp can be bought for $50-75 IIRC. I got mine from Seiya Japan, a few years back. Check eBay. Not the toughest, but micro-adjustable and Ti I fink, 18mm ends, but a bit of strap notching works wonders.
I've had a play with those clasps. They are quite nice but quite agricultural compared to the ones I have on my high end watches. The Rolex one is a thing of beauty.
No complaints from me though, I'd rather have one of those than not if you see what I mean.