I have worked with Gary and Sean for quite a bit of time. In the past, they had an issue with vaproware, but have overcome that admirably (not a dig, guys, just facts).
The only thing I don't like, and this is common among the entire platform of companies that do it, is the extensive use of Java. It is server and client heavy, so concurrent users can seriously effect the user experience.
They had once introduced a pricing plan that charged for variables! They quickly and quietly got rid of that, haven't checked to see if they reinstated it, though.
Rules of thumb:
Make sure you LOAD the heck out of the box with RAM
Mirror the drives as it's a LOT of work to recover if you lose a drive
Make full use of Sean... he's got things floating in his head that aren't documented, but are reall cool ways to make your life easier when using the product
Be prepared for the 6-8 hour time zone difference... shift your schedule so you can be assured of timely support responses. They're great with support, but the time difference can make it seem otherwise
Be aware of how they work with animations. You can show or hide based on a trigger, but they have a cool frame action tool that allows you to easily fill a coil, fire a boiler, etc. Really easy and cool
Be mindful of the alternate drivers. I'm not sure how well they're working. LON was the initial driver and is the best developed last time I used the NSX
You might be a beta site sometimes, but they'll support the heck out of you if you need it.
I'd say, go for it. Good guys and decently stable product. Tell 'em Glenn McConnell sent you (and be ready for the slap LOL)