John^3.... have you experimented with the audio to MIDI feature in RealBand?
Or the audio to MIDI feature in Melodyne? One nice thing about audio to MIDI is that you start with clean notes, and you don't tend to get artifacts. If the translation to MIDI isn't perfect, you can usually edit the occasional MIDI note easily.
An actual device that you might consider is the
YOU ROCK GUITAR Its fairly inexpensive, and is surprisingly robust and free of the usual problems that plague just about every MIDI guitar technology.
HERE'S ONE ON EBAY But.. I gotta admit.. the G2M you posted looks very cool! The application of using it with a slide guitar positions you to replicate the sounds of more fluid-sounding instruments, as in the example. Keep us posted about whatever you decide to do! I'm very interested in hearing which route you take and what results you get! No matter which way you go, I'm predicting you are about to embark on a journey of fun!