+1 on the Israeli Crystals. Due to the generosity of a member here (thanks TonyN), I've had the chance to try them along with the Reds. The Reds give a smooth, great shave, and are a favorite of my wife's right now, but the Crystals feel just as smooth to me and give a a bit closer shave--they are currently one of my favorite DE blades. The Crystals do seem to come in blue packaging--if those Personnas you've got are repackaged Crystals, you're in for a nice shave.
Here's the link to Personna's website--but their product descriptions are kinda spotty--
Personna | Personna American Safety Razor Company