The web interface is nice, simple and polished.
The service works as advertized.
The builds are efficiently managed, handled and summarized.
The connection to major code-hosting providers (github, bitbucket, google).
The received emails are raw and systematic, it would probably be better not to send emails for successive successful builds.
The website is simplistic, live console output does not work all the time.
The support of languages is very limited.
It's always convenient to set the build script into the service, it would be better to put it in the code.
The dashboard is maybe a bit too simple, a summarizing map of all projects could be very handy.
On a general point of view, the website is a bit too simple. I fear that when the number of projects increases, it lacks direct feedback of what goes wrong and where.
The service is nice and simple. It does what it is supposed to do.
Some areas can be polished and features added, but we get what we are said to get.