The ability to use one tool for multiple tasks, it's easy enough that I can understand how things work without having someone explain them in detail. It is also very flexible so you don't have to worry about being locked into something if there are better options out there. There isn't anything specifically wrong with this product but sometimes when using certain functions of gruntwork I find myself wanting more features than what they offer. This has nothing to do with their service or support team; just my own fault for not looking around other products before choosing theirs. We've been able to automate some manual processes which saves us time while still allowing our developers to be creative within those constraints we set up ourselves.