Before you buy an entire set of threads, try one or two spools of the brand and see if you like them. Some machines are picky, and we all have our own preferences for style. For example, I got an entire set of metro threads, and I can't stand them! Many others love them. I personally prefer a more matte appearance so I love Isacord. Others like shiny, and prefer Floriani. It also makes a difference how fast your machine is. I have a pro multi-needle that I routinely run at 850 spm so I need a strong thread that can handle the stress. If you run at 300-500, you can use a weaker thread.