Update took 10 mins to install (fresh WiiU, received today)
No problems so far, absolutely loving it! In all honesty, apps (Lovefilm, Netflix, shop) aren't loading any slower than my ps3...
Settings menu is pretty slow though. About 15 seconds before update, more like 12 secs now so a marginal improvement but still too slow.
NL update has taken 5 mins, although annoyingly said 11 seconds remaining the entire time....
Now finishing setting up and mooching about on the GamePad whilst we watch Lovefilm (via PS3) on the Tv! Yaytimes!