I use a number of their inks. The clogging incidence seems to depend on the printer and how often it is used. My daily office printer, an Epson 1100, has used the glossy inks for some years with rarely if ever a clog. The glossy B&W inks use the same base as the color pigments. So I assume the clogging would be about the same, as the binder is in the base and they are coming from the same source. My 1400s almost never clog go matter what is in them. The 7800 will have a gap at the same place on the Eboni MK channel if left more than 2 weeks without use, or about 10 days if it's dry. (The computer vent blows hot air on the 7800 -- not a good thing, I'm sure.)
I've used MIS color dye inks for years - first in a Canon S9000 and in an Epson 1430. The Canon had lots of problems and I'm not sure I could pin them on MIS. The 1430 never has any clogging issues. An issue you may see is that, due to the fact the printer cannot read the non-Epson cartridges, you can run a cartridge dry. This does not seem to hurt the printer but will require a lot of purging of the cartridge, with the suction syringe, and printing of purge pages. Once the cartridge is fully cleared it will usually work fine. Be sure to check all your cartridges anytime one needs to be refilled.