A colleague complained to me that the pop-up ads he launched had dramatically reduced user loyalty and increased bounce rates. This struck a chord with me, as I'd been somewhat skeptical of this format myself, but couldn't quite pinpoint why. I decided to investigate and looked here — I found an honest analysis of the pros and cons of pop-ups: good reach, but risk of irritation, and a balance between retention and conversion. It's useful reading before launching—it helps you weigh whether experimenting is worth it.
