Avoid if you are a heavy user. Works OK for small amount of data.

Great idea, poor UI and performance. It takes about 2 hours to sync 1GB. I need to sync about 2TB so it would take months to sync my files, despite being in LAN and with 100MB upload/download internet speed. Contacted Promise customer support and was told that item has some limitations but are not specified in the description. They could not give me a solution so I am sending back the Apollo. Avoid if you have lots of data.