Likes, well there are only a couple of boxes you can buy to take advantage of guitar midi. The GR20 is the best sounding IMO between it and the Axon. There are loads of presets in it but honestly half of them are useless to me. However there are a handful of pianos and organs I use and some horn section stuff that is great and the most used patch on it is this soft sax that is just killer.
I can however daisy chain it via midi to my more expensive keyboards taking advantage of their sounds, but again some work nice and others not so nice using the guitar.
Roland makes a more expensive unit but I have not tried it because this one gives me all I want. Basically when I have a harder keyboard part I cannot play I do it using the GR20.
Below is a link to some songs I wrote and performed that used the GR20 a lot,
This one some of the organs and sax (also used the JMD1 here)
This one you can hear the horns and organ
This one has the sax