While I have found the Piskei Teshuvos both enlightening and helpful, there is a review here which suggest that it should be used with care; http://seforim.blogspot.com/2007/06/review-new-volume-of-peskei-teshuva-on.h tml (i hope that this doesn't violate a log rule, and that it isnt really more appropriate to Areviim.)