I still use Circle Dock.
For me the killer ability is to have it launch where my mouse is. I have one of my mouse buttons allocated to it and this means very little movement is needed to launch programs. When you have a large screen, bumping the edge feels totally bad ergonomically, when it is not really needed. One reason why I like extensive right-click menus.
It is also portable, which I prefer.
PS The version I downloaded from the link on your site was 0.0.3.2. The About button will bring up the option to download 1.0.0.0 which takes you to a GoogleDrive. I downloaded and installed from there and it still said 0.0.3.2. It also does not lookup the installation folder of the previously installed version.
PPS I've not really played any more with it because I'm not really likely to use a launcher that doesn't come to my mouse and isn't portable. Otherwise seems quite neat.