Hi Wilkes,
EOS Link does not come with the E5000 Ultra. However, from what I've seen, EOS Link does not do much for you. All it does is provide you with a front-panel interface to emulate the front panel of the E5000. It will not transfer samples back and forth, nor will it give you more sample-editing features than what is already in EOS.
I just bought Sounddiver. I haven't had a chance to play with it much so I don't know how much it can do in terms of sample editing. So far, I've only used it for programming some presets. For that it works quite well and it integrates with Logic Audio which is the sequencer I use. I'm hoping to learn SD better in the next few months. I'll have a better idea as to its capabiities then.
I do know that SD is not fully compatible with the latest version of EOS. SD can support up to EOS version 3.x. Some of the extra preset parameters available in EOS 4.02 are simply ignored right now. I believe that a new Sounddiver module for EOS is currently being worked on and should be available probably around April or May.
HTH
Fernando