I would add that the 1900 can be had for maybe $40 more. You get a larger color screen (entrance and exit stone marks with different colors), and a digital filter (I've read). It works on co-axials and can autodetect the rate, which I hear can be helpful on a really badly adjusted watch.
Here's a shot of mine on my Breitling Galactic 44.
You can't see the entrance and exit marks because this watch is F*ing perfect!
(Oh, the amplitude is low cuz I yanked it out of the roll, gave it a few turns and put it on the TG, so not quite perfect, but close).