Instruct: Classify Amazon reviews into positive or negative sentiment
Query: Great replacement product

I installed these wires on a 02 ML 320 (95k miles) after getting a quote from a mechanic for almost $800.00 for 12 plugs (two per cylinder) and individual wires ONLY if needed. Less than $300.00 for parts with all new wires.I used Denso iridium plugs in addition to these wires and promptly gained almost 2 mpg.The steel covers weren't quite as long as the original wires but I attribute that to everything being made less robust vs. 10 years ago.My only other complaint was they only gave you one VERY small pack of silicone grease. You would need probably 4 packs that size for 12 wires and plugs.After all that was said, I buy them again without hesitation.