I too bought Spectron, based on this thread. I like it, and will be using it. But contrary to my hopes, so far it doesn't seem like a 1:1 replacement for SD at this point. I think they both do unique things that the other doesn't. I'd really like to see SD officially supported on Leopard (haven't made the upgrade yet myself). The most important point, IMHO, is that many of us have dozens of projects with SD already in there. We want those to keep working in the future.