BTC conformation time is horrible. Especially when you are transferring funds to an exchange or something and you have to wait for 6 confirmations before you can spend your coins. Takes an HOUR at least. Darkcoin and the new instant X is awesome. Takes about 30 SECONDS for 6 confirms. so cool.
*Sigh*
There is no magic "6 confirms" that relates to all altcoins. The strength of the confirm relies largely on the time of confirmation. That is why exchanges have different requirements for number of confirmations with different coins. DarkCoin's "Instant X" is not a new concept. The concept of masternodes is not new, and also cannot be compared with Bitcoin's bedrock POW blockchain. It's closer to POS as each of those masternodes must "buy in". Apples to Oranges.
We shall see whether it proves itself when the stakes are higher.
Darkcoin, eh, Dash has been instamined and is 100% a scam.
If you're looking for quick confirmation times, Bitshares confirms in less than 10 seconds(All those full PoS coins do).