Feel - The feel is very smooth and the speed is excellent. The speed rivals that of the Aochuang GTS M.
Stability - The cube is very stable, which is very important considering its fast speed. It's not quite as stable as the Wushuang, which was very rigid, but it's not as flexible as the Aochuang GTS M.
Magnet strength - The magnets are weaker than on the Aochuang GTS M, which is ideal considering its stability. The magnets definitely help with alignment.
Fluidity - The fluidity of this cube during solves is unparalleled. It never locks up, I never even get minor catches on it, and solves are very enjoyable. Corner cutting also far exceeds that of any previous 5x5, which leads to its fluidity.
Overall verdict - The Valk5 is in my opinion the best 5x5 on the market and deserves every bit of its hype. While I am currently 1-2 seconds slower on it than on my main Aochuang GTS M, it's only because I'm more accustomed to the Aochuang and the Valk 5 is black base, and I prefer stickerless.