Mine is not built with aluminium, but it has a nice surface that is both smooth and coarse at once, making the grip perfect, even after hours of use. The size is fairly standard, I can imagine it being on the small side if you have large hands though. The weight it up to you, you get a small container with four weights in them with varying sizes, enabling you to make the mouse heavier or lighter as you wish.
I have a weight in the mid-range in it now, enough resistance to offer precision but not enough to cause discomfort over time. The lighting settings are also fun to play with and you can adjust the dpi all the way from 800 to 3200 and there are tons of other sensitivity and other features as well.
I really feel like I can set up the perfect mouse for myself with this kit and the price was, as mentioned, very reasonable (I paid around 100$ for it here in Norway, this was a few years ago so this was amazing value for money).
Nothing seems worn and the mouse still appears in mint condition, I can't even count the amount of hours its been used up to now, but it's probably about 4-5 hours per day on average, at least.