is coinbase.com is good site i have heard that site is not working properly...? is there any other site we can get good wallet without any problems......?
It's okay, but you shouldn't use it as a wallet. Use the original BitcoinQT client. Or some lightweight client (which doesn't have to download the whole Blockchain) like MultiBit or Electrum. Keep the control over your own coins or you don't really own them!!!