Following up on the above...
My S10-HD paired straight out of the box w/ my iPod Touch 2G; however, when I tried to pair it with my iPad 2, the iPad 2 would just search...and search...and search.
On page 7 of the S10-HD manual, you'll see a note saying, "To pair your headphones again, press and hold the "0" (power) key until the status light becomes steadily lit in blue".
This proved to be the key to getting the S10-HD to work with the iPad 2. The S10-HD needs to be "off", then you'll have to press and hold for around 7 to 10 seconds.
Furthermore, it appears (from my own testing; your results may differ) that the S10-HD can only be paired to one device at a time. That may sound obvious, but what it means is that you'll first have to turn off Bluetooth on the paired device with which the S10-HD is currently connected, then connect it to the other device with which it is already paired. (Kind of a pain, but I can live with it.)
Also, if there's anyone considering the S9-HD or who's had an S9-HD fail because of sweat incursion (i.e., you use it at the gym, etc.), Motorola is offering a warranty upgrade from the S9-HD to the S10-HD. What you need to know is: (1) The S9-HD will fail from the least bit of sweat entering the unit through the speakers; and (2) The S9-HD sounds better than the S10-HD (a lot better...it's a tradeoff you have to be willing to live with if you want these for exercise). To get the S10-HD if you've experienced prob's w/ your S9-HD as described, call Julie Scofield in the Consumer Advocacy Office at Motorola's Corporate Headquarters: (847) 523-5852.