I haven't had any problems when using my debit card for purchases, and no, never has left my sight. Since it's a DR bank card, I just have to swipe or tap at the little machine, simple. Here's a cautionary story though: my lady friend recently lost about 2500 pesos from her BPD debit card account due to two unknown charges to some unknown to her website. Luckily she only had about that amount in the bank at the time, or it likely would have been worse. As best we can figure, her card info was compromised when paying for a farmacia or colmado delivery (using a verifone type gizmo). Not sure how, exactly. I suggest not using your card for those types of purchases. She got a new debit card, of course.