Nope, as long as you punch your self in the nuts and take
nine levels of this PrC.
It really isn't debatable this thing is a Skill helper, Rogue gets more Skill Points, Special Abilities can mean Skill Mastery (Savvy Rogue means 'take 12s') and such. And it's pay off more to dip Factotum or Uncanny Trickster. Not saying you can't as a Wing, but level 16 is a log ways away to net their goodies while your trapped in this thing.
One of the nice traits we should be measuring, double duration buffs, really isn't coming up. But ultimately Wands are cheap, saving a charge (or 50gp) isn't much when WBL excepts you to blow through so many you've given a forgive and forget budget so that's probably why no one cares.
Strictly speaking in terms of SA, this Class gives +3d6 & +1/die SA. Through a granted Bonus Feat it changes SA's damage type to Sonic which allows for further Resistance to apply (not a big deal, it is sonic) but also increases SA by +1d6.
So in example, the OP... Oh yeah he didn't take it far enough to gain this ability. Something about no level 20 example. Well at least he took it as far as he
could Wait, no he didn't. Even he stopped progressing it for something better 
Well ok, in his example + more Winged by level 16 he would have 8d6+8+16 or 52 avg (his 7d6 example, +1d6 for winged lv8).
Pure Rogue at the 16th level has +8d6+16 SA or 44 avg and in this example has Opportunist. So he probably gets one Attack more than the Winged per round as at least one AoO has a guaranteed sticker attached too it.
Which by SA alone, means we need to be talking more than five Attacks per Round on the Full-Attack action before the Winged one even makes up this AoO handicap (GTWF?). And this is a
Pure Rogue, where as a Winged we have to look into increasing SA/Attacks just to be better than the Core-Only mundane.
And if you really want SA, you dip around like mad to net +1d6 SA at every level possible. I think someone posted a +20d6 build somewhere, which is pretty excessive. So while we could talk about Factotum or Uncanny Trickster for major Skillmonkey boosts, most certainly any alternative could dip around for an SA boost as well.
