I have the 770 Tula Pink machine. I love it. Previously I had the 820, a bigger machine, but that had bobbin issues. There’s a different bobbin situation in the 770. It reminds me of a smaller machine I had years ago - i think it was maybe 160 or 180 something. I’ve had the 770 a couple of years and have had no issues.
Edited: oh my gosh I missed the post where you said you got the 790! Congratulations and have fun on your new machine!