The product is excellent. The poor review is due to the store owner/salesperson. Gwen is very knowledgeable, but has difficulty answering direct questions. She was also unable to do math correctly, present clear invoices and justify the account balance. When she entered the final payment on our credit card, she overcharged by thousands of dollars. Although she acknowledged her error and sent us a partial refund, she refused (or was unable) to justify the refund amount. There are other distributors for the manufacturer's goods, although it is unclear whether or not Gwen is connected to the manufacturer, either financially or through relatives.