Hi, we've discussed about the keystation before. If you do a search, you'll come up with interesting discussions on it.
Anyway, my take is: bad action and especially bad keybed. It makes a terrible thudding noise when you play hard. Feels like it can break anytime. They've solved a number of problems since their first generation of Keystation which was even worse.
I would recommend the CME UF8 instead. All reviews and user comments here and in other forums favour that over the Keystation unanimously. I've not tried it, but since their keys are from GEM, it will definitely have better feel and response than the Keystation.