there is more flexibility with mapping with the Rapidbike module, including ignition changes.
there is also more potential for getting things wrong. I know a guy who blew his K1200R motor by getting too aggressive with the ignition mapping.
PCVs are pretty safe - the worst you can do is dampen power delivery by over-fueling. But if you know what you are doing, Rapidbike has more power potential. Their customer support is also excellent.
2012 S1000RR, sapphire black, DTC and HEATED GRIPS
(also a LOT of other mods...)
2000 Ducati ST4 Desmodromico
2010 S1000RR (sold)
2007 F800S (sold)