I will be ordering some soon because I have 3 week old Discus fry. I get mine from Dan and have never had a problem. Bad problems can arise if they don't come from a good supplier and if you don't rinse them well every day. I used to feed them to all my fish but I can't afford them anymore and adult Discus do well on less expensive foods. IMO they are the perfect food for great growth and healthy fish. Even when the babies are too small to eat a whole one, they pick at them all day until they are all consumed.
There are lots of opinions out there. That is mine.