sportsbook review for people who bet in play and hate rejected slips

So I'm looking for a sportsbook that actually works well for in play betting and doesn't reject my slips every other time odds move by half a point. It's gotten seriously annoying getting all lined up for a good spot only to get told it's off, odds changed, try again. I bet mostly on live NBA and football so every second counts.

Anyone got experience with sites that actually process live bets fast and aren't constantly slowing you down or freezing you out?