exactlly
My very first manual focus experience was with m4/3 earlier this year and though it was better after I bought an EVF, I still found it unreliable and frustrating (after 20 years using AF !). Then in early September I starred using a NEX with peaking, and I can say I've ditched AF since and am having a blast with MF !
Since I shot only moving targets (people and pets), magnification is useless to me, but peaking is godsent. I usually set it to Mid and use yellow in good light, and light in lower light.
What one needs is a LOT of practice, but you do get a lot better after a while.
So far AF performance in NEX (and I do have the new 6) hasn't made me want to give up MF.
Almost exactly what I do; yellow and low. 90% of the time the peaking is more than adequate. I love that I choose what is in focus, rather than the camera choosing for me. I have been using my manual lenses almost exclusively for a year now and still miss some shots, and am still learning. I am getting about an 80% in focus rate when shooting moving subjects. It takes time, so don't get frustrated.
As mentioned on a subject with eyes, focus on the eyes. Also as mentioned infinity can be a bit off on some of the adapters, so pay attention to that.
However manual focusing does get a bit challenging at the extremes. When I am in the more open Apertures, (anything above 3.0), I really have to pay attention. Additionally when it is a dark environment and/or the contrast is very minimal it can be hard to find a good focus. The magnification feature is an awesome help if you have the time, but often the time is not there.
I have been using my manual lenses almost exclusively for a year now and still miss some shots, and am still learning. I am getting about an 80% in focus rate when shooting moving subjects. It takes time, so don't get frustrated.