I think the only two things that i hate about bitcoins are slow confirmation and the price of bitcoin that is continue rising because i can't afford bitcoin now because it's too expensive for me lol.
Slow confirmation can be annoying on exchanges and webshops, but when you pay friends you both now it's real time and the deal if there was a deal can go through.
But make sure to wait at least 1 confirmation just so things are set.
For small transactions, a confirmation is seldom needed.