Open source Monitoring framework

I found an interesting product called GroundWork.

However what was more interesting to me was the advert's they're using to attract customer, which are actively promoting the products open source background

"no proprietary hassles" and "open source flexibility" are 2 of the phrases from the ads.

I'd be interested to know how that approach works out for them, 'cause it's fairly opposed to what a lot of the research firms seem to say about open source, which is that big business finds the open source nature of the software a turn off...