I like that they have an idea of how to make my logo look, but are open for ideas as well! They will listen carefully what you need from your brand concept before creating any artwork or samples (which helps me decide too).
The service can be expensive if it's not done right at first time - so prepare yourself. Sometimes there might take some days until i really see/read their work which makes us unsure about whether everything fits our needs perfectly fine without having them do another one again just because we changed something small during feedback process etc.... We've created customised logos using this website several times now with great results all around!!