Regarding the larger handles...I bought my Ci1 and Ci0 unhandled, and I plug them into steel and foam handles from Monster Tools (like most of the other turning tools I use a lot). The Ci1 rougher in a steel handle filled with lead shot is a wood-eating machine, with no fighting involved. And the Ci0 also fits into the Monster hollowing rig. I can hollow out a potpourri bowl in dry ash or maple in four or five minutes.
To be honest, I don't use the rougher for the initial cuts on most pieces. I still prefer using a bowl gouge to get a piece round. (My 3/4" Thompson in a lead-filled Monster handle weighs about 8 pounds. It's doesn't vibrate much.)
When I'm going through things like bark, I'd rather use an edge that I can resharpen. I'd rather save the carbide cutter for cleaner wood.
Once I'm through any bark and the piece is round, my Ci1 gets a a fair amount of use when I need to hog out a lot of wood, and the Ci0 is great for finishing cuts on the insides of bowls, and for larger cove cuts on spindle pieces.
I've also got the Ci2m and Ci3m mini rougher and finisher (a very generous gift from Stu). They're also great tools, but they're in the factory handles, which feel a bit short to me. I don't believe they're available unhandled, but I may put longer handles on them some day.
I'm not paid, but I'm an unabashed endorser.