It would be more fair to rate every cube by themselves so I will give a short summary:
2x2: Like every other flagship it is in the higest tier of 2x2:s, fast and good strength to compensate the speed.
3x3: While probably the worst of the bundle in relation to it's competitors it is a cheap cube that has customisation like edm edges and like gts3/wrm spring compression system which makes it great if you aren't sure about that yet on a 3x3.
4x4: Alongside the WR M considered by most to be the best 4x4 on the market, and at a much cheaper price making it a safer option over the WR M.
5x5: A fast cube with medium strength magnets which is a great combo on 5x5, and also a cheap price rivaling older 5x5 without magnets.
6x6: Considered the best 6x6 since the shadow v1 m at an amazing price for a flagship. Super smooth, fast and great medium magnets strength.
7x7: Considered the best 7x7 since the Hays and Spark at again a much better price. It really is just the 7x7 version of it's literal little brother, the 6x6.
Now the price will be the best fact about these cubes. Being compareble in quality and performance to cubes at a much higher price. These cubes are great If you recently got back into cubing or aren't sure what cubes to buy for each event or if you don't have the money/don't want to spend the money to get super good cubes. because aside from maybe the 3x3 the others are considered top tier on the market. And even the 3x3 is great, just that since 3x3 are so expensive compared to even most 5x5xs or 6x6s it unfortunately is in the shadow of every other MGC puzzle
I finally got all 6 one week ago now the cubicle adds the 7x7 to the bundle. All of them are amazing and are my mains. Highly recommend.