I had been getting red neck and irritation for half a dozen months since I started DE shaving full time. Then I found out it's all about technique and prep.
I was shaving against the grain in the neck (without knowing) and I was applying lather with the brush too fast and without good prep during/after shower.
I thought many times to go back to my Fusion(s), but never did. For sure I would get an easy shave, no nicks, no irritation, no nothing.
In addition, I was reading all those guys here and there talking about getting irritation and ingrown hairs with cartridge razors and thought "for me it's been the opposite! they can't be right".
Many DE shavers get a BIC occasionally and report fine shaves. True. From what people say in all the boards, it appears that the closeness of shave you can get with a DE razor surpasses that of a cartridge one. Nonetheless, if one is comfortable with the latter, and with Mac food as well, so it'll be!