FYI - I've tried a few different brands at two different houses to extended coverage where I can not pull Cat5 and have the following impressions:
1) 200mbs: No way, More like 40mbps (real world) at best: I find it funny that they advertise these as up to 200mbps yet most only have a 100mbps port
2) Try different combinations of power points. I found vastly different speeds
3) Try different brands (Netgear was the best for me, two others were sent back as either slow or that they failed after a couple of days)
Overall, I'm pleased with how they work, and I'd lump them into a sort of "reliable wireless" - good for web browsing, streaming music, SD Video, but not quite good enough for stutter free HD stuff. I actually use mine to hook up a second Wireless Access Point to increase my wireless range. At the end of the day, nothing beats blue string....but if you can not get it there, then these are a good and portable solution.