I'm using the
Solidtek mini USB keyboard (ASK-3100SU). Currently $25 at CompUSA/TigerDirect (20010-04-30)
Oddly, the edge doesn't recognize caps lock (an Android quirk, I think), so the shift key must be held down to get upper case. I'm not having any issue with typing pressure required to make the keys work.
The edge sometimes lags the keyboard -- this seems to happen when a new program starts accepting typed input and then after about ten characters everything seems to be in sync. It also seems to happen when holding down cursor keys that start repeating.. This must be a software issue in the edge (aka Android). None of this happened on any other linux system with this keyboard.
In any case these are entirely minor and hardly rate a description as an inconvenience. I wrote this using the keyboard and managed to get this far without irritation or frustration. Definitely faster and more accurate than the onscreen keyboard.