I don't know about Cobra's kit, but Eduard's are great as usual and it's the best chioce if you want lots of detail. Using photoetched kits needs a little practise though.
In case you want a crew for your helo, you might have some problems finding one. The only one availabe for the moment is one from CMK, but they are kind of crappy (I have them so I know what I'm talking about).
I hope to hear soon from Night Flight Models, they have some very promising crew kits in hold.