In reply to Simon.

The control panel alone using SSL won't make it secure.

Ideally you would also have SSL installed on your site and the login would occur by accessing your site via SSL while accessing WPDASH via SSL also.

As it is now even if the control panel at WPDASH is using SSL, if you don't have SSL installed on your site it's going to be making a standard HTTP call to your site and logging in.

HOWEVER that isn't much different than you going to any WordPress site that isn't using SSL and logging in. So it's not that unheard of. But if security is important for the site in question you should definitely have SSL installed on your site and any services such as this should access your site via SSL.