Instruct: Classify the given review into positive or negative sentiment.
Query: Disappointed

I bought our first ones in about 2007. We love the older ones. Suggested them to many friends, and bought some as gifts for friends.I bought a set just a few months ago, to replace broken ones. They do not have the same insulation capabilities as the others. After a few minutes the outside of the glass is cold, and the ice cubes don't seem to last as long. Are there any old ones left to be purchased? The news ones don't seem to sweat, so that is a plus.