Isomorphic keyboards help you learn to play music more easily. The geometric configuration of their layout means that any musical sequence or progression is the same regardless of the key. This might sound a bit too nerdy to understand, so let's look at a quick example to show you what it really means. Let's imagine that you've been learning the piano for about a month. Determined to make quick progress, you've decided to learn all of the major chords in one day. So you start with C-major and learn all the way up to B-major. That's 12 different fingerings. Quite happy with your achievements, you take on minor chords. Once again, you learn all the chords. That makes 12 more fingerings to learn. And so it goes for every chord you want to learn.
Things are a little different with isomorphic keyboards. With their geometric (read consistent and regular intervals) layout, you learn one chord pattern, or fingering, and you replicate it wherever you want on the keyboard to produce the same chords in other keys. That is because the shape of the chord you learn works for all other keys. As a result, your learning time is sped up by a factor of twelve as you have 12 fewer chords to learn. On top of that, it also means that while playing you don't have to try so hard to remember a specific chord, scale, and/or progression. Your expression is no longer strained. This is the holy grail for those who don't necessarily want to work long and hard to develop strong piano skills, but rather want to quickly express themselves musically in a new way.