I bought this to replace my old box. This one gives better performance, and is not that difficult to set up. The documentation is lacking, though, if you want to do anything "interesting", both with the item and available online. My 'phone was failing to make calls, and it turned out to be due to a restriction on the characters in one name field, but there was no error message to explain this, nor any mention of it in any documentation. There are some really interesting parameters you could set, but I don't touch them since I don't fully understand what they do. Very good product. Good service from the seller.