It is interesting to see the varied opinions on the Hemispheres mix. Steven Wilson's remixes are far superior to the Chycki surround mixes I've heard. Mixes such as Snakes and Arrows and Signals are unlistenable to me, and I was disappointed in Moving Pictures and 2112.
However, I am glad I purchased Hemispheres (I almost didn't but saw a few reviews that indicated Chycki is moving in the right direction). On my system, the Hemispheres 5.1 mix sounds pretty solid. I am not hearing the balance issues that some are experiencing. The levels sound quite faithful to the 2 channel mix on my system (Cambridge Audio Azur 851C and Anthem AVM-50 pre), and I am hearing some discrete output. Hemispheres definitely does not sound like an upmix on my system, though admittedly Snakes and Arrows sounded horrific. I lasted 2 tracks on the S&A 5.1 and then had to reach for the air sickness bag.
Anyway, while this isn't a reference 5.1 mix by any means (Talking Heads Remain In Light is an example of what sounds ideal for my taste), to my ears on my system Hemispheres is hands down the best Rush surround work Chycki has done. It is enjoyable and is a nice companion to the original 2 channel mix.
Welcome T.O.G.!