OK looks like I will be the first to say I don't like the 3 blades for now and want Darryl's two blade conversion!
With 3 blades it will cost much more in a crash to repair, more things to setup, adjust, and balance.
Plus carbon fiber blades are going to tear up parts in a crash much more
than wood or foam blades would.
With the two blade conversion there are only two parts to buy instead of three. You can use wood blades which are cheap
and will do less damage to the heli in a crash. A two blade system is less to setup, balance, and is cheaper. Less weight also.
For cost reference:
Walkera 4F200 Parts
I see this heli great for experienced pilots that won't crash much but expensive to repair for people just starting out or just starting to learn
3D who will crash it a lot while learning. So a two blade conversion would
be great to learn on with for low cost repairs and less parts to replace.