Decided to give MMOGA a try in terms of buying in-game currency (gold/gil/etc.)
Delivery was extremely fast, the moment I made it out of checkout and payment was processed, I was messaged in-game with a location and was given the product I paid for (whole process took about 1-2 minutes at most).
No questions were asked, I did not have to reply to any in-game DMs.
They came to me, I only had to be in the spot they told me to be.
The payment process was smooth as I paid via credit card through a secure and encrypted service. Nothing fishy took place and I was given multiple receipts for my transaction (like 3 separate receipts).
As of writing this review, their prices are competitive with other websites (the product was $10 cheaper for me at MMOGA compared to other sites like mmogah, playerauctions, etc.) that sell such a service.
I wasn't able to find a way to tell who would be selling me the product or give them a review afterwards, but overall, the service was good enough that I can recommend it to people who don't care about spending money buying in-game currency.