While the idea that the Mareks are a very stiff boot is true, I do not think they will be too stiff and prevent you from tweaking or pressing, etc. especially after you break them in by riding them a few times. Yes, the Process are designed to be less stiff than the Mareks, and I think they are super comfy as well. There are plenty of people that use the Mareks on cable, but i wouldnt be surprised that Process are so popular because, as Stephan mentioned, the top ankle strap can be removed to accommodate those who like a high cut boot that is also flexible (or stiffer if you ride w/ the strap).
IF you can, i would recommend trying them both on at a local shop cuz every foot is a little different, and you might like one boot over the other regardless of what other people say.
But to answer your initial question, no, I dont think the Mareks will be too stiff to tweak/poke/press, but the ankle strap option may be why more cable riders seem to choose the Process boot. hope this helps.
Last edited by tom_paz; 02-28-2013 at 1:16 PM.