yes, that's my point, what if I don't have internet? imagine I make an incredible presentation and when I'm going to make my pitch I realize the place doesn't have internet or internet is down...

so many problem with internet can occur that I'm not sure if it's a good idea to use a cloud based service for this purpose

web-cache, offline/persistant storage ... DropBox is "cloud-based" but I can use it without WiFi

that's what I'm asking, what happens if I don't have internet? does it work offline or is there any way to make it work?

I see what you mean. The current service is entirely cloud-based meaning you can't view the slides without an Internet connection. It follows the model for most remote presentation software.

I see the benefits of having off-line presentations but that's more in the domain of Slideshare, where you can download the slides and view them offline. However this means the presenter is no longer able to control the presentation any more and this is one of the main reasons for the service.