I've been very happy with my p12. it is a single action modle. I do not have much expierience with the lda modles. I own 2 paras, a p12 and a p14ltd.
I have put 20,000 rounds through my p14 and am very happy. The only parts I have changed out are the factory mag springs which did not last, and the recoil and firing pin springs.
I have about 1500 rounds through my p 12 about 400 of wich were fired at steel plate matches. The only problems I have had are with the high cap mag springs. Traded them out for wolfs and they have worked just fine ever since.