The only real downside to having an AR or AK is that they can't be fully auto or burst, but I really don't have a need or desire to "spray and pray." I didn't plan on getting an AR, but a guy was selling it for a good price, then I found out he was also selling the 1894, so I got him to give me a really nice package deal on the 2.
Oh, and if you get an AK without a pistol grip, you don't need the bullet button. I just found out that only semi-auto's with a pistol grip require them...I previously though all semi-auto's required it.