Mike,
Personally I am not interested at all. I do mostly resi and light commercial work, and the number of times I've needed to take measurements on large paralleled feeders is so small it's not worth mentioning. I can't see any other use for that kind of probe. OTOH, I have an Agilent U1211A which has a huge jaw (enough for me to wrap paralleled 500 MCM feeders under stacked lugs in a CT cabinet) but many of the clamp meters out there couldn't do that.