I like the plethora of customizing options, and the fact that it is distributed both as a plugin & module.
One suggestion: the FB "Share" button (when activated) appears at the end of the buttons' row, while the BF "Like" shows up at the beginning. It would be great if you could move the "Share" button next to the "Like" button. And of course it would be ideal if we could re-arrange the various buttons to our own preference.
JoomSEF doesn't work properly with Community Builder and Kunena (to name a few popular components). The CB login & CB register modules do not work unless you skip CB in JoomSEF.
I also had to skip Kunena since my site's members couldn't post any messages.
I emailed the company 6 times during the last 2 weeks asking for their help. At the beginning they asked me to describe my problems. I did that. After that they remained silent despite the numerous emails I sent them.
I regret you have this experience, but we are e.g. using Kuneno on our own site - with the same plugin - and our users do not have any problems in sending posts.
So just make sure you are using the latest versions of everything.
As regards support, we do as much as we can, but our capacities are limited (usualy because of users that do not read FAQs and ask the same things over and over).