I think comparisons to the past re: who gives us trouble is just that, in the past. The Celtics with Kemba are a vastly different team than the Celtics with Kyrie. I don't think it's fair to say "Suns (or anyone else) give us trouble", because as we've all seen, we're a much different team.
Having said that, the Suns will probably give us trouble, they have accumulated some talent down there, and they have a true PG now. They beat Philly and LAC, so they're definitely capable of beating us.