These nails are truly stunning, they're my first purchase from Ersa and I also bought the hard glue set.
I will say that I have struggled a little bit with keeping all of the nails on and it's only week 2, not week 4 as advertised. I find normal nail glue has kept cheaper press ons in place for longer but do love the way that the hard glue doesn't damage my nails or the press-ons. I have bought 5 more sets along with the liquid nail glue and dissolver and hope that with more practice with the hard glue or use of the liquid glue I will be able to keep the nails on for 4 weeks. If this is the case Ersa will definitely be my go-to.