I chose to use a USB of the new ESXi 5.5 Rev 1 ISO created with unetbootin (it's on the repos of most distros). This guide from VMware has a video which explains it all. It's pretty much exactly the same as installing it - a half dozen clicks on an OK box.
When it booted up (you'll also be told to upgrade your client) and I logged in I saw all my machines that were set to autoboot
Living the dream :-)