Wireless Remotes for Keynote. Any Opinions?

Looking for a wireless remote. Something very simple to just advance and go back within a Keynote slideshow.

There seems to be a bunch out there, but the two I'm considering are the Kensington Pocket Presentation Wireless and the Keyspan PR-US2 Presentation remote.

One thing that concerns me, is that I can't get the Keyspan web site to show up, and would be reluctant to buy an "orphaned" product.

So any opinions about either these two remotes or even any others that you have experience with?

Thanks in advance for your help! Cheers!