I just bought one a few months ago, and the assembly/install was really not difficult, maybe an hour. However, getting it "dialed-in" to feed the cases reliably has taken me a long time... In fact, I finally had a few hours to mess with it this past weekend (I've got small kids, and it's difficult to get dedicated time to spend on such things...) and was able to finally use it to produce some rounds.
My only issue was getting the case to feed into the shell plate/holder without tipping on edge and jamming before being fully seated in the shell holder. I made the adjustments outlined in the directions, and still, just could not get it to feed properly. After much frustration, I called Hornady customer service, nice enough, but really not helpful. So, I returned to fiddling with the wire/arm adjustments (make small adjustments, at a time...), and got it to the point where it fully feeds the case about 90% of the time. But, I have to advance (on the up-stroke) the shell plate VERY slowly, as the case is entering the shell holder, to accomplish this... Once in a while, especially if I go too fast with the case going into the shel holder, a case will still tip and get hung up on the side of the shell holder. Not too big of a deal, if you are paying attention, as I just tip it flat, and push it the rest of the way.
I believe I would not have this problem, if the case feed arm assembly did not have as much 'play' in it, as it does. If I squeeze the 'v-block' with my fingers (reducing any play in this unit) as it's feeding the case, it works perfect. In my opinion, this is a design issue. I suppose with some more practice, and adjustment, I may be able to get some more improvement in it's operation. I'm also going to try it with .45ACP, and see if they feed better than the .38 Specials that I've been working with.
This all being said, I do like the case feeder, you get used to not having to manually feed the case, real fast. However, at this point, I believe that I actually crank out more rounds per hour without the case feeder. I'm optimistic that this will change as I get this thing figured out a little more.