I am now on ICS, which I'm finding to be a loooot faster than MIUI.
I ran MIUI V4 for a night and I just wasn't feeling it. There weren't as many things I liked about it, like I did with my GB version.
In order to go to MIUI V4 (At least, for my phone), you had to flash an early build ICS rom. I did that and I liked it a lot. So I looked into it more and I upgraded to the latest build of ICS and I'm in love. It's incredibly fast, smooth and just all around wonderful to use. It doesn't have all the customization that MIUI has, but it's great.
I mean, customizing the lockscreen was super easy. You can have 5 shortcuts in the lock ring and