Sorry if this was discussed, but after I just installed kernel-power v51, I noticed the phone doesn't react on keys or incoming calls/SMS if the processor is fully used by some process (I tried "tar -cvf /home/user/MyDocs/mmc1.tar /media/mmc1/", /media/mmc1 is a 32Gb ext2 partition, if that matters). Just after finishing creating the archive the phone unfreezed and received the SMS, which was sent during archiving. The stock kernel was more desktop friendly (kernel timer frequency too low?).

Edit: overall usability performance seems to be slower... No?