Don't believe the trolls!
Turns out these blades are just as good as the Gillettes I thought I was buying.  No the heads don't swivel.  These are definitely not fragile so, Im not sure how people are breaking them.  Maybe trying to pry open the heat fused clamshell packs? I used scissors.  I get the sense that the negative reviews are written by big razor company trolls trying to stop you from buying razors at a more realistic cost.
Rating: 5 stars