Just sent myself $200 via the WU mobile app at the rate of 1193 = 238.600 pesos. As I type this, CCL is down 1.6% to 1164 and blue promedio is down 2.6% to 1095, so it seemed to me a good time to jump on the WU rate as it's almost 100 pesos better than blue at the moment. The fees today for a $200 transfer were $13.99 for funding with a credit card, and $8.99 for funding with a debit card, bank account, or Google Pay. I used Google Pay, so grand total today including WU fee was $208.99 for 238.600 pesos, whereas $200 might have netted me 219.000-ish at a cueva.
I've had nothing but good experiences so far using the app, I have it set up for quick login via biometrics (fingerprint) and I like that I can fund the transfer using Google Pay (which does not appear as a funding option for me when I log in to the website). Today I funded with a credit card (to earn miles) and used Google Pay to avoid paying the normal WU credit card fee. I have one particular credit card from Capital One that doesn't process or treat WU transactions as a "cash advance," while all of my other credit cards (including a second card from Capital One) do and will normally charge me a cash advance fee on the backend after the transaction posts. Not sure why this particular credit card doesn't, but if I can earn miles and pay the same amount as I would with a debit card, it seems like a win to me.