The best Guitar tracking Midi interface I have found - is the Axon AX 100 MKII - they are not cheap - but the tracking blows away the Roland.
http://www.axon-technologies.n…le=article&sid=1&menu=101
It tracks slides, vibrato amazing well. But, you still have to play very cleanly though - as with all guitar midi interfaces.
I have been thinking if purchasing a Star Labs Z6 series Midi guitar:
http://www.starrlabs.com/products/ztars/z6-series
Has anyone had any experience with any of the Starr Labs midi Guitars?
Regards - Robert