I wanted SO badly to like Intense, because I REALLY needed a good shortcodes plugin. Sadly, there have been multiple bugs and it caused many issues on my Wordpress sites.
The 2nd major problem is that since there are bugs and problems (plugin has not been updated in a long time, at least not for issues I've addressed) that would require customer support to resolve. However, support is very hard to get responses with and also simply haven't addressed bugs. Their response was to use custom CSS to fix the bugs I found.
Intense seems to no longer respond via their FB page, by email, and may or may not respond in the support forums. When they have responded, customer support is not up to par with other providers.
Ultimately I was finding Intense's coding caused conflicts on my site and caused items to break, therefore I had to remove it and go back to an older shortcode plugin. I no longer have the same issues.
It's sad, as it really could have been a winner.