Java actor framework “Kilim”: A solution without a problem?

Some time ago I read a posting from a workmate, that was linking to an IBM developerworks article about the actor-framework “Kilim” and he seemed to be quite fond of it. Since I know this guy’s a very skilled technician and since actors are one of the bigger hypes in software technology nowadays, with languages like Scala openly supporting that concurrency model, and since the IBM developerworks articles are usually quite good, I instantly dived into it, only to be left perplexed.