Hmm. I have to admit, the guy seems intent on having this chat. Bringing him to Karakura may be messy, later on. We don't know when he'll drop by, for starters. And we don't exactly have the connections to make it a proper welcoming party unless Urahara and Yoruichi are willing to either help us or ask the Vizards to do it.
Also, Aizen apparently isn't here. Real important that.
On the other hand, some of the Arracnar are still pretty bad, and we can't be sure they'll let us go.
I don't think the chat is as bad as people say it is. It's not exactly safe either, but it does have some pros to it.
Not sure I'll make up my mind before the vote gets called, alas.