Last spring just before all the covid fun and games got started I took a Bernina overlocker lab class from the Bernina Academy. It was one of the national educators for Bernina. Very posh, fancy workbook, limited seating, hands on assistance, lots of samples made, great snacks. Free too.
I've never been a fan of Bernina but I left that 3 ½ hour class absolutely smitten by the Bernina overlocker. They're overbudget for me but well worth saving up for.