I recently started a new job at a firm X. Literally hours into the first day of work, I received a phone call from a firm I previously interviewed with last year, Firm Y. Firm Y offered me a position with them. Firm Y's pay scale is comparable to Firm X, but Firm Y made a better impression on me and I seemed to click more with their associates. More importantly, Firm Y requires fewer hours than current Firm X. I've decided to bite the bullet and jump ship one week into my new job. I just got my job offer from Firm Y in the mail and plan on going in to work tomorrow and talking with my boss (assuming he shows up on weekends), and just try to be as polite and upfront about my resignation as possible. I will tell him that Firm Y seems like a "better fit", and my decision is not based on any difference in the work or people at Firm X. Should I feel guilty about leaving my current new job high and dry and without the usual two weeks, or would you SFers do the same thing in my position? I don't want to burn any bridges, but at the same time, I feel like I need to do what's best for me. This situation is bit sticky because both firms practice in the same area of law, so I might run into people from Firm X very soon. WHAT SHOULD I DO? Please advise.