After watching my neighbor use his HD-8 with the cranks, I decided one would be better than hand digging, but if I could find a hydraulic tilt one, that would be the berries... As luck would have it, one showed up on ebay about a month later. Pretty decent shape, and I ended up buyng it for 1/3 the price of a new one. Sure am glad I got the hydraulic tilt, as it's a one man job driving the posts.
I did break one of the springs, after driving about 50 posts. Kencove was the least expensive. Local dealers wanted $10.00 more per spring + shipping from the regional warehouse. I figured that one broke, might as well get a spare. I ended up getting some fence splices, and the tool, which I needed anyway, because I believe anything over $80.00 or $100.00 (can't remember..) was free shipping. Real nice lady I spoke to on the phone there...
It's not nearly as fast on my little Ford 2000, as it would be on one of the higher gpm pump tractors I have, but it's a lot closer to the ground, since I'd be getting off at least 2 to 3 times, getting things lined up, for the 200 + posts that needed driven. Sure beats spuddin' them in by hand..!!
I had heard before that you should not sharpen the larger posts. I did sharpen a few of the 6" corner/end posts. A pretty sharp point, of at least a 60コ angle. They may drive easier, but they have a tendency to drift sideways, if they hit a rock. And usually it wasn't until I got down about 3'. I tried one without sharpening, and it went in straight as a die. So did the rest of them that way, and they too drove straight.
To each his own, but for the right money, a full hydraulic driver is well worth the money in my book...