[font color=\'#000000\']The shutter release is mechanical, rather than electical. You use a conventional plunger type release screwed directly into the S2 shutter release button, as in days of yore, so a lot depends on the quality of the release cable itself. Overall I have to say that it is a tiny bit slower than the electrical releases on our N90S's and 8008S's until you learn "by feel" how far down you can press the release without actually setting it off. Otherwise the stroke is quite a bit longer.
You may also find the slower FPS and smaller buffer on the S2 frustrating for bird work. I can't fault the S2 for image quality (we use four of them in our business, to the exclusion of any Nikon DSLR), but we're not chasing birds. In fact, the image quality is so good that we won't consider upgrading to the the S3 unless they do something about the FPS and buffer size- irrespective of any improvements in image quality. The high price for a small increase in image quality simply won't be a good investment, considered from a purely business decision about return on investment.[/font]