The Bernina CB bobbin case comes in and out very easily, and threads very easily too. I don't mind it at all, though the vertical bobbin case in my 201 is nice. I don't know how many fancy fuctions your 237 has, but the vertical bobbin and all metal construction are very much pluss in my book.
I agree some bobbin cases are more cumbersome, but it's usually only the high speed flat beds with rotary hook, some of them needs to be lifted up to access the bobbin case. These are vertical. I guess it's a trade off for the high speed; it needs the sturdier build in a flat bed. I don't mind different builds and models, and happily go from a drop-in bobbin case to a vertical case with out finding it a bother. The Bernina CB case and hook comes off as low noise and smooth compared to others. I think when we spend some time with a machine and get to know their finer points we get used to the differences. Both the vertical and horizontal bobbin cases comes in various versions. With the horizontal ones, you need to remember which way the bobbin case goes in. With the vertical versions it doesn't affect the stitching as much.
Last edited by Mickey2; 10-27-2017 at 06:28 AM.