I've had a Hornady case feeder on my LNL-AP for a year now and I think mine works really well. I adjusted on mine and worked with it for probably 6hr-8hrs over two different days after installing it and this patience really paid off for me.
I just loaded 1.8k 9mm about two weeks ago and out of all those loads I had four come down the tube upside down, two stuck sideways in the chute at the funnel on top of the case feeder. This may sound like no problems at all but when one sticks sideways in the funnel several more pile up on top of it. I just lift the feeder off and dump it out. That take 30 seconds.
The other problems I had with it were caused by me, like .380 cases mixed in with my 9mms and I had two 40 S&W cases that I missed and one got stuck in the drop tube half ways down, the other came down but had a 9mm inside of it. Again, my fault.
Now, I just loaded 200 more 9mm this morning and I had 2 come down upside down and several tripped going into the shell plate, several didn't want to start in the resizing die and had more trouble with these 200 than I had with the whole 1800 I loaded two weeks ago.
Once I get my rhythm and speed control figured out (like slowing down to slow when the case is going into the shell plate) the press and case feeder work like a dream.
Your always going to have some come down upside down and some the get stuck sideways in the funnel above the drop tube, but that's the nature of the beast.
Makes de-priming fired shells very fast and easy. I de-prime at about 1200/hr
Is it the best case feeder made? No, to many moving parts, can be intimidating to tune in.
Will it do a good job for you? Yes, if it is set up right.
Is it noisy? Yes, but once the drop tube is full it runs intermittently.
Would I give mine up, Not a chance. Once you tune it and learn the rhythm the feeder and press needs, learn what the sounds mean that come out of the feeder, It becomes very easy and second nature to run the whole press as a single machine. You can concentrate on watching the press operation and only have to listen to the case feeder.
Hope this answers some of your questions.