I have 23 brother machines one is a cheaper model that I got after my house burnt down I bought it as a fill in till the insurance came thru, I find the cheaper one is a bit slow but never misses a beat, the other is a 1500D embroidery machine I love it dearly but it is fussy on the cottons I use. I use the cheaper one when my embroidery machine is in use.
the other brother I have is a 4 thread overlocker or serger I think you call it in the USA it neads a service at the moment someone played with the tension dials and I've not been able to use it for a while. now it snaps the 4th thread all the time