Hi there :) Yeah, been using them for a little while now. The cross promotion and extra exposure offered through share2steem is a powerful tool to get Steem noticed and to bring other great content creators over to Steem.
I actually ran several Twitter and other social media campaigns to get people to check out share2steem.
Being able to cross post from Steem to other platforms as well as vice versa is definitely going to bring more visibility and users to Steem.
Followed you :)