This item was purchased as a replacement to one damaged in hurricane Ike last year. When the local Home Depot no longer carried the product I started searching the Internet. Amazon carried the unit through one of its affiliate stores, Blue Grass Battery, at a very good price. However, upon arrival I discovered I had ordered a 24v unit instead of the required 18v system (my error). Amazon quickly replaced the unit with no hassle. I simply returned the 24v unit and ordered the correct model and all is well. I even recevied a personal call from Blue Grass Battery's customer service department confirming my satisfaction with the product and transaction. I subsequently purchased two more items from Blue Grass, via Amazon and am 100% satisfied with all the transactions. Great job!