I haven't availed of the piso fare from Cebu Pacific but still managed to book a flight for the BF flying from cebu to manila on April. I was really excited to get the promo fare for half its original prize but unfortunately the return options are already sold out so I have no choice but to for the go lite fare
which also helped as I was discounted a hundred pesos (2.5USD).
Then, just today when I visited the site again, I was really surprised some flights opened again for the promos this summer! Check the the Cebu Pacificsite for more details