I got this deployant clasp to go with a Hadley Roma band and couldn't be happier.  The installation was very simple and the band and clasp fit together perfectly (as you would expect being from the same manufacturer).  If considering a clasp, be sure to note the width of the band at the end, rather than where it attaches to the watch.  The band I got was 20mm wide at the top, but narrowed to 18mm making this the appropriate buckle.

The push button action to open the clasp is very smooth and feels solid.  The ends of the clasp click comfortingly into place when snapped close.  One thing to note: if you have small or overly round wrists, this may not be a good choice for you.  When closed, the buckle lays against your wrist with a small curve and is approximately 2 inches long.  If your wrist is narrower than that, I imagine the band would look funny wrapped around your wrist.  However if you have a larger wrist, the buckle is very comfortable and looks good.

As other commenters noted, this is a brushed stainless steel clasp, not a polished.  Depending on your watch, you may need the twin of this clasp with a different finish.  Fortunately I saw the description that this was brushed which is what I needed.  It's a very brushed look, closer to titanium than anything else.  The picture in the product description accurately captures the shade of steel, so make sure that is what you're looking for.  It was what I wanted, and I'm glad I went with this clasp.