I've also had an RFXrtx433E for a few months, so here is a quick comparison.
Most of my RF devices work correctly in both systems.
Here are the differences I've found so far -
Multiple devices received for Owl CM113 (1)
Had to disable the sender unit, new pairs of devices were being added several times per minute, with different IDs
Owl CM130 data is not being received (2)
Receives Owl CM119 every 6 seconds, more frequently than RFXtrx (1)
Receives commands from an Energenie 10-button remote (ENER002-C) (2)
Sees them correctly as 5 On/Off devices
Attempt to send to COCO Enerenie wall socket (1)
RFLink Sending: 10;GDR2;000041;1;ON
Error: RFLink: Error/Unknown command received!...
Notes-
1. Works OK in RFXtrx
2. Does NOT work in RFXtrx