In high school we played 10 game pro sets with a tiebreaker at 10-all. It does make the amount of time a match takes somewhat more predictable. It also seems more fair than using a 10 point tiebreaker instead of an entire 3rd set. An 8 game pro set is too short.
If time is an issue, instead of a 10point tiebreak in place of a 3rd set, I"d like to see the third set start at 4-4 and play out the 3rd set just like the other two sets from that point on.