Originally Posted by myp
The 46" Vyper is my favorite plane for all the qualities that others had mentioned. However, harrier with the Vyper is definitely much harder (others might call it being different :-) than the 42" 3DHS Slick or the Addition. So, if you are getting the 46" Vyper, be prepared to be frustrated for some time in trying to harrier the Vyper.
The harrier is absolutely more active. Harrier turns, in particular, are somewhat unforgiving of passive piloting. That said, with some foamies we're actually created a class of pilots that fly 3D somewhat passively. That, besides being a poor technique, doesn't really prepare you to fly a variety of different 3D models.