To overgeneralize, I bet there is a copy of the mesillas yesharim in almost every orthodox home, shul and beis medrash. I'm wondering why this work is so popular and accepted. My wondering is ...
Is there a set that has "Kol Sifre HaRamhal"? The have "Kol Sifre HaHida" and other Rabanim, so maybe they'll also have all Sefarim of the Ramhal?