i have my eTrayz for almost 2 years, function has been stable ... the only issue I had with the initial setup was the accessibility of eTrayz over the Internet, but this was due to the modem setup provided by PLDT - was able to correct this after several tweeks found in the Internet
I have my eTrayz wired on a Gigabit Ethernet network using Linksys WRT310N wireless-N router ... the only other device I have wired is my TVIX NMT player, I also have an Xtreamer NMT connecting to it via wi-fi, my PC, laptop, and Archos tablet connects to the eTrayz via wi-fi
Playing 1080p files from eTrayz to my TVIX NMT with the wired Gigabit Ethernet is like having the disk connected to the player directly, no issues at all ... cannot do this however from my Xtreamer, PC, and Archos, as significant lag is noticeable ... no issues however with SD and 720p videos over wifi on all the devices I use to play video.
Regarding file transfer speed, I usually transfer files from my desktop PC to the eTrayz over wifi-N ... i've pasted screen shots below for your reference ... the speed is quite satisfactory ... in the screenshots shown below, the speed is approx. 8+ MB/s for transferring files files from eTrayz to PC, and 6+ MB/s for transferring files from PC to eTrayz
PC to eTrayz over wireless-N, ~6.28MB/s ... takes around 30 minutes to transfer 10.8GB file
eTrayz to PC over wireless-N, ~8.62 MB/second ... takes around 10 minutes to transfer 4.37GB file
Note that I have my eTrayz at ver. 1.07 firmware