KJN128 - Yes, I do have a hydraulic toplink, as well as a hydraulic side link. If I recall, the whole thing cost me $1300 or so. I did not already have the rear remote hookups, so that price is for them as well as the cylinders, hoses, etc. and installation by my dealer. (The rear remotes have quick-disconnects on them, so I can hook up other things besides the Top-'N-Tilt... not that I own anything else to hook up to them... yet) I use the box blade a lot, so it was worth it for me to get this stuff installed. For more occasional use, I probably would have stayed with the manual stuff.
If you do get one installed, I'd consider doing two. It probably will not be twice as much, since a lot of the labor is not duplicated. If you only get one, the toplink is the most important, IMO. If you do get the sidelink as well, keep your old adjustable mechanical link. I had the hydraulic link put on the same side as the controls (makes it easier to operate the controls while you are turned to see what is going on with the link). At the recommendation of several people here on TBN, I put the old adjustable link on the other side to give me a greater range of adjust ment.
John Mc
PS When you get a chance, please consider filling in some of your bio information on the "control panel" page. It makes it easier for folks to tailor advice to your equipment and uses if they can refer to it.