I use a double edge safety razor on my underarms and legs. They are fairly thickly infested, my husband teases me when I shave, using the term "deforestation". (My dad was a logger...)
Honestly, you won't notice a lot of difference in the use. You do have to be careful not to slide it sideways, and you need to make sure that the clip that holds the razor down stays tight.
I've used two different designs. One you twisted the handle, and the top opened up like doors, to drop the razor in. The other, the handle unscrewed, and the top came off in two pieces, top and bottom, and the razor sandwiched between them.
The reason it is important for that to stay snug, is that the top of the thing holds the razor down, but it also BENDS it, so it curves to the proper angle against the edge of the holder. So if it loosens a bit, you can end up with the angle wrong, and it is easier to cut yourself. You get used to that fast though, and it ends up not being much of a problem once you are used to not pushing the handle a certain direction (which can loosen it).
I get a cleaner shave with them than with triple blades. Stopped using them for a long time, it got really hard to find blades.
My mom had some, and she eventually went to plastic disposables. I liked the use of the old fashioned ones better, so I appropriated hers when I was a teen - my dad overheard her arguing with me, and sided with me - I used it, she didn't, so she grudgingly gave it to me, along with another one. I only have one of them now though. That is how I ended up being out of generation where razors are concerned!
