I have been in Manila for the last 3 weeks and Monzo has been brilliant. Spent over £700 using it here.
I have had no problems using it anywhere except a few food places that don’t take card.
Most bank machines charge 200-250pesos to withdraw although my hotel’s BPI ATM did not charge so I stuck to using this when I wanted cash.
Combined with a local SIM I felt much safer using Monzo over my debit card. Other benefit is the 60+ php to £1 vs. The 50-55php I got exchanging cash in the UK.