Welcome - wow a BRAND new Cutie. Bernina 830 NEW or the old mechanical sewing machine? Like WOW if you have the new one - was to be my Ultimate but funds don't allow. It's almost the price of a car here in SA. Don't know the thread you mention but my 440 uses Marathon with no problems, although I prefer a polyester embroidery thread.
Several women I know uses Metro thread and we've had no problems with it.
You have gotten good advise already. Just want to add a hearty welcome to Cute.
Every machine has its own likes and dislikes, best to buy a starter group of colors and try them. Good luck.