Very easy to use, huge possibilities. You can use wildcard rules to control differente urls. The tool is incredibly flexible. You can handle a big number of campaigns, and even tagged them, add notes, and share with other teammates.
You can start campaigns, pause them, archive them, very easily. Very easy to find old testings.
The AB tool is the best part of the tool.
Good knowledge base, including videos. You can search in deep, and almost everything is solved. I ve tested many other tools, and I recommend this one strongly.
I am testing the support right now, and I have no idea if they are going to answer me in time.
Maybe, as usual, it could be cheaper, or the free version larger.. ;)