I have been using Cobalt for about a year and it has been absolutely fantastic. I am constantly amazed at the amount of functionality that they have built in to Cobalt. Sometimes it's hard to find documentation for certain things but the developers are great (Sergey in particular) at getting back to you quickly using their forum and offer a lot of helpful guidance. I started using Cobalt for one project and I've had several projects come up since where Cobalt has proven to be a perfect solution. It will take you a while to figure it all out but when you do, you'll be amazed at how many things you'll find Cobalt is great for. It's definitely an investment in your time you won't be sorry you made. Make sure you take advantage of the forum on their website to ask questions and share with the rest of the Cobalt community.