Just completed 3 new Zigbee installs in the last few months using XP8 & T3V's using 2.4. The signal is not as strong as the 433 but the 2 way is well worth it. You have to put in a few more receivers w/ 2.4. I have seen a lot of mixed comments about the 2.4 systems, but I think the latest features and product are great! Keep up the good work RTI.