I went for my first ever visa extension in Marquee Mall, Angeles City yesterday.
The entire process took less than five minutes and they will also give me an Alien Certificate of Registration card in one month's time.
I was able to collect my passport after 5.00 pm on the same day.
It was a lot more expensive than I expected, as they charged me for their 'express service' without telling me. It came to PHP 8,042.50