I ran a PVL for several years, it worked OK wouldn't say it was exceptional. as I recall the timing was set at .090 btdc, then one day the bike backfired and when it did it busted the clutch cover and the kick starter shaft. It does not use a keyway, so it can/could move which is what I think happened to mine, or maybe it was the Nitrous, either way i took it off and put a stocker back on. I think next year I'm going to work on the 250 ignition some more, it was considerably more noticeable power delivery than the PVL, as I've said before, too much. I'm going to try a flywheel weight to calm down the delivery a little bit, try and find a happy medium.
For me, I don't think I'll ever reinstall the PVL again, but who knows I said the same thing about the Lectron and I'm using it.