Mine just kind of deteriorated over time. It sometimes doesn't start when the light is green, or doesn't stop when you stop it. I just got a Stackmat timer. The quality is much better and is worth the $30 xD
I'm not that fast of a cuber (average 17)... but I got 6.813... hmm.
Also.. This is why I think I was able to do it instead of doing R U R' U', do R U' R' U. It flows much nicer and.. yeah, it works.
Does anyone have the problem on their MoYu WeiSu where the stickers start to shift when in bags, etc? I left it in a bag and the adhesive sticker "goo" became less "sticky". Some stickers can be moved around with a push of your finger.
Weilong doesn't require any modding. It is super fast and can corner cut a lot.
Fangshi ShruangRen is also good without modding. It has a scratchy feel which goes away in a couple of weeks. That's why I don't like it anymore.
Dayan Cubes are kind of outdated. They are still good though and can...
I own a shengshou tiled and a dayan ridged/stickered. If you were to get a shengshou, get the stickered one. But get the dayan one (it is 10x better). I don't own an mf8 one, but I tried one and it's not bad.
The ShuangRen looses its scratchy feel (which I love) after a couple of weeks. It also gets slower due to that. I still use it for one handed though. I use a weilong now.
You should do 4x4, 2x2 and pyraminx gets boring after a couple of solves. 4x4 is now one of my favorites! It is just the 3x3 with some edge pairing, and two new algs.