Pros/Cons of Solids at 5mo

My son turned 5 months earlier this week. I know the American Academy of Pediatrics says to wait until 6 months, but he has been cleared by his pediatrician to begin solids when I want. He has also reached/surpassed the baby food milestones. He has lost the tongue-thrust reflex, watches what I eat and drink, and can even sit unassisted for short periods of time. So what I'm looking for are what are some pros and cons of introducing baby food at 5 months of age?