MissingRemote published a review on the SiliconDust Quattro (HDHR5-4US)
A quote from the article:
SiliconDust recently upgraded their HDHomeRun (HDHR) CONNECT line of over-the-air (OTA) network tuners to include a $149 MSRP four-stream Quattro (HDHR5-4US) companion for the $99 MSRP two-stream Duo (HDHR5-2US) model. Both models feature 100Mb Ethernet, all new internals, and an attractive form factor. Updated silicon components should bring power savings, so if SiliconDust can also maintain the stability of the older models we will have a solid recipe for success whether you just want an OTA tuner or are looking to cut the cord.SiliconDust Quattro (HDHR5-4US) Review @ MissingRemote