I installed Hyper Vent after discovering some mildew on the bottom side of the mattress, sitting on a fiberglass deck in my Hallmark, after winter camping. No condensation issues since then so the Hyper Vent is doing what it was designed for.
I like to think heated air circulating under the mattress warms it up, but with the blankets/sleeping bag overhanging the mattress not much air actually moves. The topper typically starts out below 40F and stays cold pretty long.
I might try a heated mattress pad under the memory foam topper.