I really enjoy the ease of use and the ability to use virtually an endless amount of plugins (VSTs). The User Interface is incredible. Once you get use to it you can do virtually whatever you want inside the program. The ability to move part of the GUI around allow for a customized look for you and only you!

I like the easy of use of the piano roll, the automations layers, integrated effects and instruments and mainly the sequencer. Overall the interface it's very easy to use and the speed of production in very high.

FL Studio is my first and I think the best software to making music. It has great library of sound and plugins. And there are also many thirdparty plugins (thanks to VST). I use piano and orchestral plusing for my work. At first look FL Studio seems to have very weird interface but if you use it for some time it is great and simple. At the same time FL Studio is very advanced.