Canon 5100
We have had many many calls on our 5100. It's the same frame as the 4000, but faster.
It seems pretty twitchy, and is down a lot. We don't have your feed problems, but we do have a lot of problems.
1. It's like it has a bad spot on the back side of the engine that constantly thins out coverage. It happens fairly regularly, could be a regular maintenance item that is brought on by need for cleaning.
2. It won't hold color for more than a few thousand sheets, sometimes a few hundred. It seems unreasonable to me for a production class machine to go in and out of color as fast and as far as it does. Why bother with ultra accurate calibration with a densitometer when you never know how long it will last? Pantone matching? Ha!
3. Coated paper... Don't even get me started. Won't duplex text weights, very finicky about paper type in the R1 deck, wrinkles, flakes, or bakes. You can only print coated heavy from the big deck. Bypass has major deletion problems on Heavy card.
4. Dusty, black and cyan for us, but reputedly a dusty engine since the 700 series from mid-90s.
5. Haloing from text to solids, a weak point for many engines, Konica is even worse, but not a good attribute.
6. 12x18 - It's a good thing we trim down all our 12x18 because the poor dear won't hold image on the outer 1/2 inch worth a dang.
7. Drum areas are very touchy. We are constantly getting hairline deletions or full length fuzzy deletions.
8. Error codes will lock you out and can persist for days or weeks while service techs scratch their heads.
It's a good thing our contract was built to be a bridge plan to the ImagePress 7000 or I'd be after someones head. I'll be glad when we pack ours up to leave the shop.