Where to start?

Is this USB device…

RFXtrx433 USB 433.92MHz Transceiver

…the latest and greatest to use for x10, weather sensors, and blinds in the USA?

Why is USB better or worse than the LAN version relating to plugin features and general functionality?

About to buy, just want some feedback.

The X10 compatible version is not 433.92 see Receivers

So there’s not one device that does 310 and 392?

Can you use two interfaces at the same ?

No there is not one device to cover both US and EU frequencies.

You can create two instances of the apps to include two devices; however I would review you setup holistically including your co-existing x10 before purchasing.