My experience with MIUI 10.29 V6.4
I am somewhat new to rom-ing my droid. ie: have only used CM and this rom, and have only been rooted for a couple months. I am a quick learner and I understand software and electronics as it is my job. Take this for what it's worth and hopefully someone will appreciate the info from my experience with these roms.
I tried this rom for a week, and it was a really good rom. For the most part everything worked and well too, I like this rom overall. I chose to go back to CM 6.1 though and here is why:
In short; speed and battery life. I would say from my experience that MIUI is not slow by any means, perhaps comparable to CM 6.0 in speed, but CM 6.1 is noticeably faster and less laggy.
Note: I run a lot of apps, to the point of running out of space, and I use them all. I know it may not be the best idea, but thats how I like my phone set up.
Battery life was good when not over-clocked, comparable to CM 6.0. When over-clocked battery life was horrible (full charge lasted 4 - 8hrs depending on use).
When over-clocked I ran into this: anything over 1Ghz would heat up the phone noticeably and lag, and eventually start FC apps and home and become unusable until it cooled back down. The only abnormal part of this is that it started acting all wacked out when it got warm. In CM I also over-clock my droid and I always over-clock past 1Ghz, usually around 1.2 to 1.266, but it always keeps working just fine.
I always set up setcpu to run my phone at 800Mhz - 1Ghz when not plugged in and around 500Mhz when the screen is off, when plugged in I max out the particular kernel I am using (1.2Ghz - 1.66Ghz). I did this the same way for both MIUI and CM as well as ran all the same apps and the phone was pretty much set up the same with both roms. I used jdlfg and p3 kernels.
This post hopefully will help someone and if you are more knowledgable and have some tips for me, let me know. I am always looking to make my phone run smoother and faster, with the best possible battery life.