Instruct: Classify the given Amazon review into positive or negative sentiment.
Query: Not an improvement

What is pictured is the traditional slip and pull mantle. Past experience with them has been excellent. Open mantle, slip over gas vent, tighten and light, np.Instaclip is poorly designed in its engagement and release, which may be the reason for the mantle not to setup properly.Used to think...gas good, battery bad. Now LED rules