I currently have a Harmony 880 which is an IR only remote.  The 890 is an RF remote which is supposed to releave some of the issues of the 880.  It does feel unnatural to hold the remote at the entertainment center until all the IR signals have been send, which in some cases can take 5 seconds, maybe more.  This is particurally a problem in my case since the coffee table often times blocks the line of sight to the devices. So I have to hold the remote up high.

Hopefully they fixed the cradle contact issues of the 880 too. I can't tell you how many times I've put it in the cradle to found out the next day that it didn't charge.

The 880's buttons are also a little flemsy and it doesn't respond as quickly as an OEM remote (even after tedious trial and error modifications). In any case I hope th 890 has addressed some of these issues.

The 890 supports ZWave, and hopefully it will be able to support Insteon when Smarthome releases their RF protocol.