Played with one, but couldn't afford it.
Pro:
n-th way adjustable trigger (pull, cant, shape, weight, creep)
various trigger shoe's available
built lighter, for faster lock time
complete drop in unit, replaces entire factory assembly
good reputation
Con:
Expensive, and can be difficult to source in Canada without import/export forms
Complete redesign of the mechanism, not compatible with other's drop in parts....break something and you're out of luck until you can have it repaired
no idea about warrantee or CDN service provider.