Both.
He's won me over a lot with the campaign, which has been run and managed excellently, mainly through the strength of character of Jeremy being compared against May, and the media's prior portrayal of him. The manifesto has also clearly been a huge success, both providing a clear differentiation between the two main parties, and largely setting the agenda of the campaign. For the first campaign since 2005(? earlier?) it's been Labour driving the discussion points of the election. The party also appears to be doing well in winning over Green and Lib Dem voters it previously lost. All of these points are also things the Corbyn leadership campaign promised, so you have to say that he's achieving a great deal of what he promised to. I definitely underestimated him this election.
I'm also 90% sure I'm still voting Lib Dem. Even if it hasn't quite been the promised Brexit election, Brexit is the issue of the day. He totally failed with that campaign, and if he gained power, I've little confidence in his ability to successfully manage it. In terms of this election, it seems clear that Labour's strategy of agreeing to mostly follow May's Brexit line has worked, and largely negated it as an election issue. But I only see economic disaster from a Labour government agreeing to Brexit at the same time as implementing an anti-businsss program and significantly raising corporation taxes (I realise, only to 2010's level). I don't want a race to the bottom but I don't want us to leave the single market
and disincentive UK investment at the same time. I'm also nervous about the prospect of anti-capitalist McDonnell and Corbyn being tasked with negotiating our replacement trade agreement with the largest trading block in the world, though the competency of May's team doesn't ease my worries here.
Locally, my decision is helped by the awful Kate Hoey being our current MP, and the Lib Dems seemingly making it one of their main target seats. Ignoring anything else, she deserves the boot for pursuing a Brexit vote in the constituency with the highest remain vote in the country. UKIP aren't standing here so as to help her chances ffs. I'd love my vote to contribute to throwing her out of parliament. That said, Labour seem as strong as ever in London and I'm sure they'll hold onto the seat. Bookies put the odds at 1/5. In that case, hopefully my vote contributes to the cause of the next non-Corbyn leadership candidate.
Sorry for the essay, you asked.