The service from Excellence Plumbing LLC is four stars. The technician was friendly and efficient. However, their price was exceedingly high for thirty minutes of work. I didn't receive an estimate in advance because the first two times they serviced my reverse osmosis water filter, it was covered by the warranty and the manufacturer recommended Excellence Plumbing LLC. Unfortunately, the third time I needed servicing the warranty had expired and I was charged. After the fact, I called around and found other service companies that would have charged half as much for the same service. In summary, the service was itself was excellent but I won't be able to recommend this company to others, nor will I use them myself in the future because of the expense.