I've bought the Launchkey 37 in first place to be able to control Ableton Live more or less without a mouse - and in this regard, I am more than satisfied. It enables me to control everything I desire, directly from a controller. Additionally It has many useful features, like Arpeggiator, Scale and Chord Map – which I discovered recently – and everything is surprisingly readable on its quite small display. Regarding its portability, it’s not that small – but it has 37 full sized keys – which are a pleasure to play and comparable to other synths, in that price range. Although it’s lightweight, it gives a feeling of quality – especially the knobs and endless encoders. I have to use to the drum pads a bit, which are much softer than on the AKAI MPK II series. All-in-all a very good buy, and totally recommend to anyone trying to get a controller for Ableton, with just enough keys to play along.