I agree with you about wizards - generally almost but not quite as bad as supplied CDs. But I was in a rush at the time, with the engineer wanting to be on his way, so tried it. Amazing! Worked a treat.
What a daft restriction these days re the password. On the other hand should be safe enough, and given the rest of it,

.
Re auto setup of wireless again I prefer to do manual settings, as that's the best way to understand what is going on. That helps a lot when trying to diagnose a problem. However for some reason, possibly to do with the length and impressiveness of the default pass key, or maybe because I thought it might do better than me in view of the main setup wizard, I gave it a whirl.
The WPS seems from the Help to be an industry standard. The AOSS something to optimise wireless when used with a Buffalo receiver (dongle or card) at the computer end. So I pressed the button and clicked the WPS screen one and bingo.
Darn thing told me my laptop can't do 40Mhz or two-channel

. Stuck at 130Mbps max.
I bet if you are honest, like me you didn't really expect it to be much good. Perhaps acceptable at the price. But it really is top-notch so far? Even if it burns itself to death in a couple of years you can get four for £100! Is that GUI and its facilities good, or what?
Makes you wonder what the high prices of all the others are all about.