I have had it done once at Cosco. I noticed a couple of things my car felt more peppy, but that doesn't necessarily mean it was faster. Secondly my lifters do not tick at idle, I had one liter than made some noise at at idle (quite loud), that problem no longer exists. Finally my base oil pressure if a bit lower on the guage (I am a bit of freak on this guage as I spun a rod bearing on my Mustang years ago), this is likely due to the reduced sludge in the crankcase and oil gallaries.

So overall it worked for me, hopes this helps.