I like O'Neil. Got thrown in the deep end at Bournemouth after Parker threw a paddy, and did a solid job. Kept them in the Premier League, which is pretty much all you can ask for for your first season back at that level. Bournemouth decided they wanted to change manager (as is their right), and so brought in the current manager. With hindsight, that has proven to be the right decision, but I don't think O'Neil would have done a bad job if they'd kept him.
Went to Wolves, and I thought he did reasonably well again. Had the rug pulled from under him with some of the transfer dealings they did that year, but still assembled a competitive side that had some notable results - for example they beat Chelsea and Spurs home and away, beat Man City at home.
Had more key players sold from under him last summer (Kilman and Neto). Was able to bring a few in, but none were able to fill the gaps left, particularly by Neto. 2 wins, 3 draws and 11 defeats from 16 is a poor record admittedly, however the fella that replaced him required a real hot streak of form toward the end of the season to fend off relegation concerns. They were 5 points ahead of Ipswich and Leicester, whom both had a game in hand, in late February. They then went on a run of 6 straight wins, and they finished 17 points clear of the bottom 3.
I think that as long as he isn't screwed over by having key players being sold from under him, a la Nigel Spackman, he'd be a very good choice to take us forward. I remember him being on Sky's Monday Night Football a while back when he was Wolves manager, and they had him talk through tactics they employed in a win away at Bournemouth. Really impressed me that he and his staff had found a really obscure fragility in the Bournemouth setup which they exploited a lot throughout the game.
If we brought him in to replace Wilder, I'd be happy with that deal. He wasn't a first choice for me, but he's one I would have a good deal of optimism for.
