can somebody list the pros and cons of being a vampire lord? my main concern is health/stamina/magicka not recharging in daylight, if someone could also clarify that.

I have not done the vampire quests yet but im pretty sure there are artifacts you get to negate some of those problems.

Done and done; Click the link in the spoiler for the wiki page with the answers to your question.

So being a vampire lord in human form will not make npc's attack you? i didnt see anything about regen in daylight though...