By far the best tool to build customized from east to complex applications. It has plenty of features and you can achieve almost everything. Of course in order to get the most of it you have to spend a lot of time but it's sure that you will be rewarded. The gyus in the forum (Rob, Hugh, Troester) as well as the whole Fabrik community are very helpful and even if you are a novice you will find always an answer! I use it for more than 3 years on different projects with different complexity and I will continue to use it because it is no 1!