Pros
I was brought in Apr 2013 to help move the software products forward, and deal with technical debt. I hope to counter the 2 negative reviews I see here. The founders have big hearts, willing to listen and change. The core product (awesome and powerful, first of it's kind) has kept them at the forefront of the pump/fluid handling industry.
It's cool to watch Google Analytics in real-time and see users on our apps from all around the globe. Impressive.
Lots of new opportunities to re-architect our major legacy app. Lots of new opportunities to develop modern UIs and brand new Rails apps.
Cons
The age of the product is showing, and there is a lot of technical debt to work around. Need about 2x the dev staff, as it is hard to move quickly on legacy code base. But this is not that unusual!