Yeah, the keylab essential 49 is also my first controller. Always wanted a Moog modular but at those prices... Not. When I saw the Arturia Modular V, I jumped on it. Used a casio 99.00 thing without frills and then went for the 49... I debated between the 61 key and the 49 and, since I can't play but rather want to compose, I decided on the 49 (backed by a salesman at the Moog Audio store)
The fun part is setting channels for the keyboard as well as the Pads and, you can set the actual key that each pad uses (some presets use C3 while others use C1 etc...
All you can do is experiment, read and try.