I agree with M. Paul - Out of the box, the extender didn't function on my protected network (it may be OK on unprotected ones, but who has those nowadays!!??). I too flashed the new firmware, and I still wan't sure that the thing was working. Came back to it the following day, reset the extender and started from scratch with the new firmware and eventually I can see an improvement.
It was a concern that when I switched off the power to the extender, it lost settings, but it only did that once, so hopefully it was only a minor glitch.
Ignore the blurb about one-button set up - that's only for unprotected networks.
As mentioned, you need to modify your PC's IP address to set the extender up using the CD supplied (tough if you have a netbook with no CD drive!), otherwise your PC won't "see" the extender. You only get to know that if you look at the User Manual on the aforementioned CD. The Quick Start Guide doesn't mention this.
When you do get it set up, you need to go into the web based browser and interrogate the unit to check it has altered the region to UK - mine remained on USA until I manually changed it.
If you're a novice, technophobe or impatient, then don't buy this. I have a little experience in setting up networks, and I was getting to the point of sending this back. Perseverence overcame this, and, for the past couple of hours at least, it has been working well.
Three year warranty too. Hope I don't need it!