It might be fine for a personal site etc, but be mindful that lots of people still don't understand that websites other than .com exist (i.e. don't get a .io domain if you want to sell to the general public).
I say "dash" and I honestly rarely have issues getting folks to our page. The worse part is getting people to understand the letters over the phone (half my customers don't understand what a phonetic alphabet is so I can't just use that every time... "How do you spell Sierra?").
My boss, on the other hand, seems to have the worst time telling people about the dash. He tends to fall back on our second domain (which just redirects to the main one), and even then still has issues (I think he just talks too fast).
Oh well, it was fun for a year.