Its been stable (I haven't noticed any drop outs or periods of no internet).
Its still quite laggy on my 360 box, especially when I view the box sets/movies page, it takes quite a while to load all the pictures etc. Its connected via ethernet so should be fast.
It seems my ping times are a bit all over the place now? Not sure. My speed tests on my phone around the house is pretty good, at >350Mbps.
Overall, much more reliable so far (only been 3 days though!)