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Although I have never owned an Eel Model N, the K-50 is my all time favorite machine. It has a very small footprint so it fit in a tiny compartment in our utility trucks. I've used it through 1 1/2 Durham traps all the way up to soft stoppages in 4" lines. It's not meant for roots but when it is the only snake on a rough-in truck, it will open it up until you bring back a mainline machine.
You must operate with caution with the 5/8" dualmatic cable in the Model N as you can flip it in drum if not careful and you get in a hurry. The way the pulley connects to the drive shaft is just with a set screw, although that seems cheap, I've not had a issue with it coming loose.
For secondary lines I feel the Model N it is the best option out there. I have used quite of few like the Spartan 100, K400, Mini-Rooter, K50 to name a few and I would take to Model N over them every day. Never used the K3800 though which looks to be a nice machine.
Not sure on the RPMs off the top of my head, but I'd say around 200 RPMs. Never had a secondary blockage it couldn't open up, unless there was a collapsed line under a slab. I've used it multiple times to clear 3" building drain blockages through a toilet, but I would never use it on a building sewer.
Egg shells of great distance require a jetter. A snake only stirs them up and might punch a hole. They don't wash away with just a snake and water flow. Egg shells are worse than coffee grinds.
An open wind high speed sectional will do a much better job than a slower tight wind drum of opening the line and stirring up the shells. The open wind will act as an auger and move the material around much better. But a jetter will actually flush out the shells.
If you don't have a jetter, you don't realize what you're passing up. My jetter did 4 separate jobs yesterday. From roots to mud, sand and debris. There is nothing that comes close to what a jetter will clear and wash away. Especially on area drains that fill with debris, sand, roots, gravel. Nothing comes close.