I have my Toyota EZ1 which has served me very well. I especially appreciate the automatic threader, and the slow speed function.
A couple of years ago I got Brother overlocker for $15 at a market but never managed to get as far as threading it. Just a few weeks ago I took it to a lady at my nearby shops who does dressmaking for help with it. She had a look and couldn't figure out how to do it so when I saw how hard it really was, and that it wasn't just me, I decided to buy a new simpler one. She said I should sell the Brother as it was a good machine so I tried that, but no takers so that's back in the shed.
A couple of weeks ago I got a Janome 8002dx overlocker. It was already threaded, so I've had a great time with it until tonight when I got a big mess of cotton stuck in the feed. Consequently it's now unthreaded and with needle plate and foot removed, waiting for me to get it back together tomorrow.
I wouldn't really need any more than these 2 machines.