[travisp]

What is the quality of the visits like? When you factor in time on site, pages viewed, bounce rate, etc. is stumbleupon still providing better traffic? It might be, but the answer isn't obvious to me without knowing this type of data.

[oldstrangers]

Depends what you're looking for. If you're being paid by CPM, then yeah, they're great visits. If you're looking for conversions, then probably not.