I am usnig SE Xperia Mini pro with 600 MHz ARM 11 processor, Adreno 200 GPU, Qualcomm MSM7227 chipset with Android OS, v2.3.7 firmware. I will say for using a custom ROM you need good hardware and Xperia series is best hardware I find in last few years mobile usage.
I will not name myself as a techie but I love gedgets and want have use all the hardware feature. Here are few of my obeservations on Mini pro, All below given feature are core hardware and supporting :
Features:
*Superuser 4.0
new ring desing
full LDPI
autobrightness is working
sense theme*
Fake xLoud - Improved sound quality. Improved EQ DSP Manager.
Bravia Engine - Improved image and video quality
More RAM - Rom saves RAM
Fast - No load on the processor at 600 Mhz
Best FM Radio - Improved signal reception by increasing the voltage.
Best 3D performance - New Adreno 200 libs for fast playing games
Best 2D performance - New Gralloc libs for fast playing videos
Best Video Camera - Excellent video recording. Video quality is greater than 2300 kbps, 480p - MP4, sound quality is 128 or higher kbps - MP3, M4V format writes
Stable - Rom is stable. Big changes will not be paid
CWM 4 - Need for CM7 (Official)
DualTouch - The screen supports two touch.
For 2.1 kernel - Rom support a standard kernel from Sony Ericsson, it is desirable 2.1.1.A.0.6
TouchScreen - TouchScreen works fine. Thank you very much slade87
Latest Version - Android 2.3.7
CM7.1.0 native keyboard light (no need for script or app) very good battery life fully working touchscreen even without kernel complete new build I put a lot of work into almost working usb tethering (still stuck on RNDIS maybe its lun1 and not lun0??) full working camera rewrite PointingDevice Interpreter -> No Touchbug! Droidwall Ready Every Flashlight/Torch app from the market works now complete LDPI build (also Lockscreen, LatinInputMethod, etc..) SEMC new 4 Corner launcher or ADW or whatever you want latest CM source (last sync 09 October 11) finally fixed Statusbar and Statusbarflashlight button 480p recording without issues (remember please 480p is "only" 640*480) alot of small bugfixes/performance/stability (locale, i/o, libservices, libui, etc) fully working automatic brightness for display (Settings -> Display -> Automatic Brightness)USB Native Tethering Wifi AP/ Tethering fully native With ZombiePanicKernel no Chroot native Keyboard App to replace SuqashiInput uploading sources to git add ZombiePanicKernel to ROM add Kernel Features into ROM
Very robust hardware which all the above features, which is remarkable .....
Hatsoffs to SE Xperia mini pro U20i series