sorry for the slow reply. I've just laid my hands on two sets of the CX5350 for the coming season so I have no experience with the Hyperions CX 5350 as of yet. Last year, I tried Hyperions VX 5000 ( heavy, but durable, 25 C cells ) and I know others that are using FP 5350 with good results, i.e. more than 150 flights !

Hyperion comes from this "source" http://www.hyperion-eu.com/howtobuy/

All the best