I love signal on android and have been looking forward to this, kind of rubs me the wrong way when I'm put in "line"
Made even more fun by the fact that unless you spam your friends with a useless link, you get to watch the number of people ahead of you climb.
I started out at ~600, and now I'm at ~1200.
Forces all the die-hards who want in to try and get some people interested.
An app like this is only as useful as the number of people who use it.
I would be _far_ more likely to tell my friends about the product if I could actually use it and be able to vouch for it (as I have with the mobile version of TextSecure/Signal).
Forcing me to get my friends to visit a page where they will find out about an application they can't even use is just annoying.