Just got back from a several week work-trip. I took a chance and brought the Pinto Rig as my main pulley and left the bigger wheels behind.
I'm pleased to say this little pulley is no joke. It's my new favorite piece of gear. I carried it every day and it's small enough to be unobtrusive when not needed and efficient enough to get the job done when called upon. It handled everything thrown at it.
For heavy loads and intensive use I don't think the Pinto will replace a bigger wheel like the CMI's. The small diameter of the sheave seems to add a bit of friction on heavy loads. But for most jobs in most situations I think it's a great compromise between size and ability.
A pocket powerhouse.