The fact that the Pro BSP will work with arbitrary geometry makes the move to a pro only feature a bit easier to swallow. If it was the same old BSP, then this wouldn't be the case.
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It may help to think of it this way, with A7 you are getting an updated rendering engine. This engine uses a new format (ABT) that improves on the old (BSP) format with much quicker build times and, in many cases, improved performance.
Based on the current private beta, this isn't the case when using high quality lightmaps, or at least in my limited experience with it. In the case of one specific level (the arched "Super Nintendo" hallway) the lightmap calculations take 3 minutes when in high mode. In low mode it's a mere 10 seconds, however this is how fast the current A6 build takes when in high mode. Performance during play is also impacted, but it is a detailed scene where the framerate hit happens but again it doesn't get hit in the current A6.
I don't know if the current beta compiler is buggy when it comes to building or if that is simply the tradeoff. Regardless, it's still much faster than BSP with visibility turned on.
