yes, it's nice simple module which just 'does it'.
I'm using it at the internal corporate site to book some conference rooms. But the default view shows user only the time and object reserved, not the author and person it was reserved for.
there's no access to the list of reservations to the ordinary user either. it could be very nice to have more flexible display settings to show additional information or/and more flexible permission settings.

perhaps it could be done more straightforward if the module used node based content... at least it would be in the 'mainstream' of drupal.

what's your opinion?