You don't tend to think of keyboards as something that can be improved upon, the basic model works well after all.
I have an iMac with an Apple magic keyboard which I've found perfectly usable up to now. However, after connecting this keyboard, you realise just what you've been missing.
The keys are so solid and the whole thing is built like a tank, I would think its virtually indestructible given how solid it feels. The keys make a very satisfying click and they are a joy to use. I'm very much a two-finger typist but even that feels more assured with this keyboard.
The lights make it a bit more interesting again. Choose from 17 different patterns, or even record your own! Great fun.
The hard keys at the top all work really well too, and the volume roller switch is really clever and great to use.
It's geared towards Windows users, but works well with my iMac, just doesn't have Mac specific keys.
A fantastic keyboard, well worth the money.