I'm interested in the coins because of the extremely fast block confirmation (20 seconds) and the projects ideas that are being discussed.  There are dozens of coins on the next that aren't used anywhere.  The reason BTC and LTC are the leaders, is because you can actually do/buy things with them.  Most other coins have 'high hopes' and can be traded/used for what?   Bitcoins or Litecoins?  So how valuable does that actually make the other alt coin?  In my opinion it makes them pretty useless. 

Xencoin has taken the initiative to jump-start the economy and the usefulness of the coin by developing places that the coin can actually be used.  With the super fast confirmation, and the high number of coins that will be available, I think this coin is going to build a 'day to day' usage perception that other coins have not yet achieved.  Think about it; bitcoin takes almost an hour to confirm a transaction - do you think that would be acceptable in a grocery store or other 'business' checkout?  Twenty seconds might still not be perfect, but I would rather pay back a co-worker for lunch and have a confirmation in seconds, rather then having to check later that night if the transaction was successful.  Again, I believe, the coin will be useful in daily life.