Volt Vulture batteries any good?

Has anyone got any opinions on the Volt Vulture batterires like these?

http://www.ebay.co.uk/itm/Sub-C-Batt...item416eec9638

Generic random brand. I wouldn't bother if you are after any performance

Thanks Gary,
I`ll stick with Vapextech then I get good results with them.

Go to lipo!

Not for this project, I`m saving my lipos for the feathers :-)