Nope. I would not date then if they told me upfront. I know myself, and I know what bipolar looks like. I don't do well with men who have more mood swings than I do, so I would stop things before we got attached. If I could handle the issues I may not be as quick to leave, but I know I can't.
I've read a good deal about BPD/HPD 'cause I was in a past relationship with somebody I strongly suspect had that condition. IF they were self-aware and actively seeking treatment and getting it, then MAYBE I could see getting involved with them. Maybe.