Long page loads aren't fun for anyone. Use WPSocialite to take control of heavy social sharing links and load them how you want!
I love the concept and it works really well. Occasionally a few glitches - one button may not load, but I think this is usually a browser issue.
I would like uses to be able add their Twitter username, so tweets go via @USERNAME. I have had to edit the plugin to add in this capability myself.
Also the ability to make style modifications via settings, as opposed to having to edit the plugins CSS code would be good.
We are currently using the plugin on Technology Bloggers and it works a treat!
Overall a great plugin :-)