So far my only complaint is just the normal first release growing pains. It has problems unrelated to PBR, like crashing consistently on teleports. That happened with 6.6.17 when they first released it, then a couple weeks later they had cleaned up those issues. Otherwise the NON-PBR stuff does not look strange, or any of the other fears I have seen expressed. The mirror effect is pretty neat, but less ambitious than hoped. It has a slow refresh rate. I saw a mirror hack for Firestorm way back a few years ago, that did a beautiful mirror surface in realtime.
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