I purchased a home with those blinds. Every single one of them has worn a groove into the cord lock, rendering them unusable. Absolutely ridiculous, and fixmyblinds wants $11 for each replacement. Problem is, even after replacing the cord lock, 6 months later they're broken again.
I went with cordless shades from blindster.com, and they're performing great (knock on wood).
I went with cordless shades from blindster.com, and they're performing great (knock on wood).