I think since I started growing facial hair I've been using shaving with the typical cartridge razors from gilette (mach 3, fusion, etc). But a few weeks ago when my father died I decided to try my hand at using his safety razor. I've been pleasantly surprised by how close of a shave I can get with this single blade stainless-steel design on this razor!
The first pass gets as close and as smooth as any cartridge razor and with a second pass it's flawless.
Here's a picture the safety razor that I have now with some blades,
I've only used the shark blades so far... so I don't really know if there a noticeable difference between any of them. What I do know is that they're damned cheap compared to cartridges! You can buy 100 of them on Amazon for like $10. I used one for about 3 or 4 days before I replaced it (my facial hair is not as tough as my brothers but not soft either). Compare that with the typical Gillette cartridge pack that runs about $10 for 4 or 5 cartridges.
I was watching some vids on youtube and one of the common complaints I've heard about safety razors is the extra time required to shave with one... detractors of the safety razor frequently call the process a 'ritual'... but that hasn't been the case for me. It might take 3 or 4 minutes longer but the result if very satisfying.
I don't think I'll ever go back to cartridge razors unless I'm in a jam and that's the only thing available.