if you take your chosen thread-wrap a length of it around one hand's fingers- wrap the other end on other hand's fingers and give it a tug---and it doesn't break---or if while using it it is not breaking---it is strong enough to use- just because some people don't like some brands does not mean it's bad-it's just someone's choice-or often---something they have heard-with no real idea or experience they make a choice.
give your thread a (tug-test) see if it's strong-good quality-if it works for you -is the right color-right weight- right fiber content for your project it really doesn't matter if it's coats& clark, YLI, superior, sulky---or any of the hundreds of other brands.--- don't limit yourself because some one said---'oh you should never use that company's product'
i have spent over $20 on a cone of (quilting thread) that was not usable---broke every couple inches-was horribly frustrating---then bought the same company's thread at another time and it was fine- just check it-and use what works for you