Darkcoin is the only x-Coin that's reasonably stable as far as I can see.
XC - tanked
CLOAK - tanked
VRC - hacked followed by nuclear detonation by the devs
XMR - tanked
XDN - lovely, virgin territory. Pump coming soon
No FUD - I'm holding all of these except for XC which I dumped. I never expected them to get very far but I thought they'd get a bit further than their last highs.
As it is they're doing what all clones do after their initial pump by the looks of it.
I've sank a mighty 0.1BTC into XDN toknormal, I'm expecting great things, it it tanks too I may cry and eat some comfort chocolate, I warn you now!