I have several of both the Epsilon and MX2 and have used both. Believe it or not, I really like both. I will get a new R7 as I see it as an upgrade to my Epsilon. I prefer a limb driven. Having said that and as to your question about field repairs, one can do field repairs to a cable driven if one just knows how to: a) replace the string in the rest if needed; and, b) knows how to tie it (serve it) onto rather than through the cable. It's really no big deal. You just have to remember to take extra string material with you into the field, which I always do.