I just recently picked up DE shaving after a 30 or so year absence. I wished I would have never got into cartridge razors. The whole experience from the smells, to the relaxation, and quality of shave: I will be hard pressed to do a cartridge system again.
I have used a Treet silver, a Rapira Stainless, and I put in a Persona Barber blade. The persona 5 pack I got at Sally Beauty Supply and for now I love that blade. It is so smooth with no irritation under my chin and neck. Both the other blades I have tried have given me irritation in those places. Matter of fact, the shave this morning was so great I really didn't want to stop. That is in stark contrast to the Treet blades. I didn't even get finished with my shave and already was feeling the irritation on my entire face. If someone wants the 9 I have left just PM your address. The Rapira blades were smooth for two or three shaves. I flipped the blade over and got one more half way decent shave out of it.
Anyway let me end with a "Thank you" for reading my post.
Shave on
John

P.S.
When the persona wears out I have an Astra Superior Platinum blade to try out.