I'm thinking about buying one; anyone have some long-term experience with it?

(I'm assuming the Vortech kit is the only one available.)

1 year and 4 months here. The driveshaft stripped after about 6 months, but the revised shaft is still OK.

That's what I wanted to hear. They told me the jackshaft was replaced with a better version. Any quirks or oddities happen to you since installation? Change your oil/spark plugs more often, run hotter engine temps, anything like that?

Yes, the longevity is great to hear, especially with the new shafts. My supercharged SVT should be running tomorrow. Just a couple of minor things to take care of. I'm all smiles now.