I've just started watching Alias and am on ep 14 of the first season. I have to say that this is one of most well written shows I have seen. With JJ Abrams at the helm I should never have doubted, but this is the first real show that has had me hooked since the first season of prison break.
For any fan of spy shows this is a must watch! It seems that I missed out on a gem when this was airing on tv. Thank goodness for Sidereel!