Steve gently prodded me towards the VG-99, I couldn't believe how he could get so many rich sounds from his stick. I bought one and have never regretted it. I have owned several Roland modules over the years (for my electronic drums) and they are pretty bullet proof. I won't hesitate to take mine out for a gig - if I ever get to that point
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I highly recommend it. I'm not sure about the Roland GR-55, I am intrigued but have never used one and I'm not sure of the differences, but that might also be an option.