Instruct: Classify Amazon reviews into positive or negative sentiment
Query: Excellent shape, lousy key response

I love the shape of this keyboard. The curved, split design feels wonderfully natural under my fingertips, and the wrist wrest provides excellent support. Unfortunately, the key response is terrible. Keys are spongy and require a good bit of force to press. The worst offender is the space bar, which, as other reviewers have noted, is wobbly and unresponsive if pressed anywhere other than in the middle (and, given the split design, the middle is a difficult and impractical spot to hit). The space bar also rattles quite loudly, which may not be appreciated in a quiet office setting.I really wanted to stick with this keyboard for its excellent ergonomics, but the key response was a deal breaker. It's back to the trusty old Comfort Curve Keyboard for me. Now if Microsoft could figure out how to combine the light, pleasing keys from that with this one's ergonomic shape, they'd have a real winner.