I fitted Blueprint discs and pads about 4 months ago, and yes they now squeal too - only when damp during first application in the morning, but unfortunately now constantly when driving (almost inaudible unless window down). This is despite plenty copaslip to prevent this happening. The squeal didn't start right away, but it is starting to get annoying now - I'll have to investigate further - maybe a common problem with Blueprint parts, although they generally get a good reputation for quality.
Pete