Speed - Much faster than Valk5 ootb, but can be adjusted with setup.
Magnets - the outer magnets are the same strength as those of the Valk5, but inner magnets seem weaker, which I prefer.
Feel - it feels like a mix between an Aochuang GTS and a Valk5, combining the best things from both (smoothness of Aochuang, crispy feel of Valk5.) Also, just holding the cube, the pieces feel more rounded at the edges, kind of like the Aochuang GTS.
Corner cutting - corner cutting of outer layers is as good as the Valk, but when you try to corner cut two inner layers, say doing Uw' 90% of the way, and then doing an Rw' without completing the previous move, it causes really serious lockups.
If we take another scenario, but replacing Uw' with U' the lockups are almost non existent, as compared to the Valk.
Stability - same as the Valk.
Final thoughts - this cube performs as well as the Valk5 and much better than Aochuang GTS at less than half of the price, I would recommend it to anybody wanting a new 55, be it a beginner or someone who is sub 1. But I would also encourage trying it out at a competition and comparing it with a Valk, as some people might prefer that over the MGC.