There are a couple head shavers here that use a straight. I shave my head daily but 99% of the time it's with a DE Slant. Rarely will I use a straight for a head shave, if I do it's a heavy grind or the Feather SS. I've never used a mirror always by feel too.
SRP really should make this a Thread or sub thread (whatever it's called). It is asked about a lot it seems. I would do a search...

In fact I think I'll make that suggestion