Revisor has one of those old-fashioned Free and Open Source Software development communities, allowing anyone to make a contribution to Revisor. In fact, Revisor has not bounced a single patch since the project started. Therefor, it improves faster then any of the other compose tools, and is better adaptible to your needs and expectations, because unlike the other utilities, Revisor is not limited to use-cases that apply to Fedora Project Release Engineering.