That's not my opinions (or rather, many people share my opinions):

• Kailh Choc v2 switches aren't bad (in fact, I'm typing this on a laptop with those switches and I like them), but there are better switches out there. Plus, those flat keycaps look really awful to type on. But, point taken, to each his own I guess.
• The Kensington Expert Mouse is widely regarded as the best trackball in the world. That's why it's been in continuous production almost unchanged for three decades.
• The 3DConnexion SpaceMouse (and derivatives) is the CAD industry standard.
• Being able to use those things all at the same time is better than swapping between a trackball and a 3D mouse. This is plain obvious. And being able to position them however you like on your desk is also plainly better - if only for left-handed people.

Those are just hard facts, not lofty claims.