iCal, Busysync, and Snow Leopard

When I was using Tiger, I had iCal 2.0. I wanted to sync back and forth to my Google calendar. So, I bought a 3rd party app called Busysync that did the job just fine. Now I am using Snow Leopard, and my iCal version is 4.0. I am still using Busysync, which syncs just fine, but it looks like the current version of iCal can subscribe to my Google calendar without Busysync. Indeed, I just bought my wife a MacBook Pro, and I set up iCal to sync to Google Calendar no problem. So, is there any reason to continue to use Busysync? Is there something that Busysync does that I am missing here?