My NX's extendable lower links have been great. My
B7800's 3pt setup is about as awful as there can be: can not stabilize link arms; not extendable- I have to play Twister to get things hooked up. I had a QH but it didn't hook up to everything (not the box blade, which couldn't be modified- it is QH-like but not). I then went with Pats for a while but found that the ends would kind of twist and bind. I "solved" the
B7800 issues, for the most part, by getting QH implements that I need only insert pins (rather than spreading and pushing the link arms on pins. I'd love to have a QH on the NX, but my RC is older and it would have to be extensively modified; other thing is that EricTheOracle has noted that a Cat2 QH ends up smashing the fenders on the NX (unless you're overly careful about raising the 3pt); a Cat1 just seems a little lite. Biggest plus on a QH is that your top link is docked all the time: I have to cable up my hydraulic top link on the NX; on the
B7800 it just flops around.
And then there's connecting up PTO shafts... (QHs make this activity a little harder)
If I ever get a welder I'll be attacking my NX's RC so that I can utilize a QH (to spare me of messing with the top link all the time!)