I installed v5.1 client this morning.
Just did a few minutes flying, but didn‘t noticed a real benefit from the new version so far.
EA is still not usuable in VR Single Pass Stereo mode. There are significant fps drops noticable. But maybe this is due to my old GTX1080 which is awaiting retirement so urgent......
In non EA mode I noticed flashing smoke textures, e.g. The chimney smoke. I‘ll observe that issue futher.
Though Milviz weather radar is not yet updated, it seems to works with v5.1.
Active Sky does not work yet with v5.1. It stops working after launch.