Making starting stacks bigger is really good. Give people some extra time at the tables, and with more chips in play, late stages of the tournament should be more fun to watch as everyone would be deeper nearing the end of the tournament.
But this BBante change I dislike completely. Although it can really slow down the game when the dealer needs to remind players to put the ante, this format is "faster" but is not good in several other aspects.
First thing that comes up is that your BB is effectively worth 2 BBs. Meaning your 20BB stacks is effectively worth 10BBs. It should greatly change the perspective of the hands played. Should a 30BB stack (effectively 15BBs) use push/fold strategy for a short stack that is less then 20BBs worth?
Another thing is that, having one player give both ante and BB, it seems as if that particular player is being pressured pre-flop, as he has most of his chips in.
Also, let's say there is a 3x bet pre, the player on the BB has to add another 2BBs, regardless of putting ante already. That makes it really expensive to defend the blinds, which is really a crucial part of the game.