Instruct: Classify Amazon reviews into positive or negative sentiment
Query: Great concept but could not install on Craftsman compressor

The concept behind this product is excellent. Unfortunately it cannot be installed on my Craftman air compressor. After contacting the manufacturer they indicated that they know it has limited applications but do not identify those applications. I rate the comapny as innovative in the idea and totally usless in functionality and customer service. I will not do business with them again (they've already gotten enough of my hard earned cash).