Sabayon indeed is a great distro, but version 4 didn't measure up to expectations. The poor hardware support, at least in my case, has left a negative impression. I only hope the upcoming revisions are a lot better and more usable than the current one. However, this doesn't mean that Sabayon won't work for you. Considering the impressive amount of work done to improve on the previous versions, Sabayon is a must try even if you don't want to replace your current distro with it.

Overall, the new version left a neutral impression on me. Will I use it? No, because I can't get certain things to work even after editing the core files. But it may give you some good company, so don't hesitate to take it for a spin, at least.