Performance alone is at least four stars. It's about as good as the YJ mini cubes, maybe *slightly* more catchy, or a little slower. Solving experience is lovely, especially after some break in.
The reason I claim this is the best 7x7 is just because this fits in my pocket! (I wear baggy jeans with huge pockets, and admittedly, I have carried the YJ MGC 7x7 around before, but it's uncomfortable.) Because I can carry a 56mm 7x7 so easily, I have been solving 7x7 more often in the past few days than I ever have before. As a "grown-up" cuber (whatever that means lol), I can't solve all the time. No 7x7 enables me to practice as frequently as this one does, and consequently, no 7x7 has led me to improve as quickly as this one has.
It's my favorite 7x7, and if your situation is anything like mine, it'll be the best 7x7 you've ever had.