Back when I got started in machine embroidery my husband purchased
a 160+ spool set of ThreatArt from ebay. Some spools worked ok with
my machine but MANY did not.
Now days I PERSONALLY only use Floriani thread now, with the exception
of some variegated & metallic sets that I have. I am working on getting all
the colors.
Some people make not like having the wide variation of colors, but when
working on a LARGE color change (15+ colors) it is great to be able to have
the range of colors in each grouping so you can get the shading effects.
Of course this IS just my own personal thoughts on embroidery thread.