My main complaint with cloudkick has always been the wide price gap between the free account and the first paid version. I would have paid for their agent based service for a few of my projects but at $99 a month for the cheapest version, it would have cost over 5x what the server it was monitoring cost.

I think they would have grown much faster with a smoother price curve. Make a plan with 2 or 3 servers of full monitoring for $30 a month to grab the low end of the market when people are just starting and putting in the foundational pieces of their technology stack.

Overall though, they're really good. They seem to have done plenty well anyway. Congratulations.