Sure it does a good job of directing bubbles out of the way, but that is because the exhaust tees are about 8 inches wide. It really is a huge regulator. I would direct anybody that has fallen in love with the popularity of the Apeks to go with the new ATX second stages because they will cause a lot less jaw fatigue.
But, what does bubble interference matter? Any reg will have zero interference when you are in the normal swimming position, so I prefer to go with a lower profile reg that will cause less jaw fatigue, even though there will be a little bubble interference on the line.
I use a SCUBAPRO Mk25/S600, and I think it is the best regulator on the planet. Apeks is fine and dandy, but SCUBAPRO's internal design (piston) is seperior for delivering air, and the S600 is a great breathing regulator. But, to be honest, the difference in breathing in any High Performance Reg is negligible.