Bitwarrior, it's a one-way atm, meaning you can only buy bitcoin, not sell bitcoin.  It's the fastest way to buy bitcoin, since you can just feed peso into the machine and it sends to your external wallet.  But it's not the cheapest alternative.  For that you might want to check out one of the exchanges like coinxchange.ph or coins.ph.

I don't know what the limits are.  There's no user registration, so I guess it's not limited.