I have a new 55" TV and wanted to mount it on the wall above my AV stand (a low one) and between my floorstanding speakers. Initially I wanted to be able to move the screen out to where the face of the speakers are, some 26" away, so an articulating mount was needed. To make matters more complicated, there's a wall stud directly in the middle of where the center of the TV would be, so if I had a mount straddling two adjacent studs the mount would be off center by 8" or so.
I found
THIS wall mount, which uses four 1/4" x 2-1/4" long lag bolts, aligned vertically on a single stud. It allows me to put the screen right where I want, which turns out to be about an inch closer to the wall than the back end of the speakers. The TV can still be seen from anywhere in the room without speakers encroaching upon the full view of the screen. Absolutely ROCK solid, the only complaint being that it's a little to easy to swing side to side. It only moves if I'm deliberately repositioning the TV, stays in place otherwise.
There's no brand name whatsoever on the unit nor it's installation manual, typical of a Chinese made product though excellent quality it appears to be. I should say that because I knew the TV would be well away from the wall, I did not want to see a huge ugly frame bolted to the wall. This one looks very neat looking behind the TV.
EDIT: Added photos of the mount itself.