Hello, I'm the webmaster of http://www.dondusang-paris.fr (blog about blood giving in Paris)
While I was preparing the site, I used the plugin to mask the site to potential visitors before all articles and posts were ready. It worked very well !
I wish I could have been able to specify the exact time of opening (at this time in the plugin you could only specify the date, and the time is supposed to be midnight).
Other than that I'm very happy of this plugin and I recommend it to anyone who needs to mask a website while preparing a major update or just before the main opening.
Thanks a lot !
[ signature removed ]
http://wordpress.org/extend/plugins/custom-coming-soon-page/