I have K&M, Pumpkin and Sinclair NT-4000. Of those, the Pumpkin and NT-4000 are great.
The K&M works well, it's just harder to get set up. You end up with at least 2 of them and maybe 3 to down to 8.1. That's because once you get them set, you don't want to mess with them any more. I expect that the same would apply to older Sinclair and similar tools.
Whatever brand that you go with, go slow.
I suggest that you get the carbide mandrel. It's like buying insurance. Buy the best and cry once.
I've used a lot of different lubes. Frankly, most everything has worked, as long as you go slow. I've settled on using an STP and cutting oil mixture. It works and it's easier to clean off than STP/Mobil 1. I'm going to try some of the new Redding liquid just for fun.
I like the motor that Paul B (Pbike257) sells. Keeps you productive while getting the speed right (Slow!). Expand, trim to length, chuck it in the motor, rough cut, fine cut, inside and outside chamfer and you're done.
I have a Wilson length trimmer. I square the primer pocket after trimming to length while the case is still in the Wilson "chamber". I pop the case out with an old, soft baseball. I know it sounds strange, but I had it handy and it works.
Go slow, but if you still feel heat, suggest that you keep a bucket of ice handy and put the turner body in it (thin plastic over the ice, trimmer on the plastic, cover the bucket with something to seal the top). Again, strange, but it works.
Go slow. Be careful. It's a shame to get a case nice and prepped and have it drop on the concrete shop floor. :'(
I rinse off the lube with cheap, but industrial strength, fingernail polish remover that my daughter gets at Wal-Mart. You have to be careful with it. It'll take the finish off of just about anything.
Go slow (have I mentioned that before?) and measure, measure, measure. Measuring neck wall thickness is great, but NOTHING trumps the actual outside neck diameter with your bullet seated. That's the bottom line.
I'm a small fry, but what I get from hearing the big boys talk is that ensuring clearance, both length and diameter, is critical. Bill Forrester told me "Cut thin to win". That's when I moved from 8.6 to 8.1 and also trimming to 1.495 every load.
FWIW, YMMV, Greg J.