I've got one of the Konspira Tachikoma specials. I noticed the colours are a bit off on the cel-shaded edges, and there's little video glitches here and there. I'm going to wait until someone else subs them (if they do).
As for the normal episodes, I'm sticking with LMF. They may take their time (as stated on the webby), but they do it well. As others have stated, they have short and fluent lines, and context/techie language errors are non-existent. A good all-round fansub.
As for trying to keep up with fast-paced subtitles, that's what the pause button's there for [img]i/expressions/face-icon-small-smile.gif[/img]. If something goes too quick to read, I either pause it or wind it back a few seconds. It lets you take more in (subs and details), as well as reviewing the cool bits (like 2nd GIG, ep 01 beginning) [img]i/expressions/face-icon-small-happy.gif[/img].