Ordered an RS815+ from Compadvance, seller sent a much lesser model RS815. Call Customer Service to advise of the mistake and got told they need to contact their warehouse to find out what happened and arrange for the correct unit be sent. Was advised that I would get a call back the same day, no call came. No response to the e-mail sent overnight. Had to call again the following day to be told that their ordering system was to blame and the website should not have had been showing the RS815+, but it as an RS815. Asked to speak to someone senior, as Customer Support unhelpful in resolving the issue. Have been stalled and delayed, had the phone put down on me while waiting to speak to someone more senior, now being told I have to wait 4 days as everyone is unavailable. In the meantime, I have a unit that I can't supply as part of the system to my client. Very, very poor. Will never use again.