This thread reminded me of a question that I had for the Rikon guys, so I called them. When I finished with my question I asked about the VS upgrade. It's set to run $139. It will have a new motor, two new pulleys and a new switch box. So I don't know exactly how "easy" it will be to change out. Having already been inside mine, I think that while not necessarily difficult, you are going to strip the spindle down from the knob in to the pulley to change it.
As for timeframe, the guy that I talked with said that he's due to take delivery of another test unit this week, and after he puts it through its paces and approves it, then it'll be about 45 days out from then.
I'm still interested, but all will depend on how things are gong with penmaking/selling and baby stuff (he turns 8 weeks old tomorrow) as to whether or not I'll be able to justify it.