A few things.
a) Doesn't require all users participating to sign up for a Google and G+ account (Unsurprisingly, asking potential customers to sign up for a Google+ account to see a demo isn't generally approved of)
b) Doesn't cap at 10 viewers
c) If you want to avoid the 10 user cap and requirement for Google/G+ accounts, doesn't introduce a lag (which Google Hangouts does if you are doing live streaming over YouTube)
d) While the server requires you to run a Windows executable to show your screen/application, the viewers only need to go to the join.me
website and enter in a 9 digit code you provide. No special plugins required (i.e. GoogleTalkPlugin RPM or EXE), it just works with most web browsers (Chrome, Firefox, even IE)