I'm one of the lucky ones who always connects at 8128kbps 
However, I had a Netgear DG834PN and it would disconnect on an irregular basis (a reboot would always reconnect at 8128kbps, but it was a pain).
I decided to try a Thomson Speedtouch as they were recommended by Zen, and I got a second hand 780WL from fleaBay. I don't think that it has ever disconnected nor needed rebooting since the day I plugged it in (and connected at 8128kbps
).
So yes, based on this limited experience, I think they are more stable.