each person has his/her own style and way of writing. the previous post says it well, don't over-revise and always take time between drafts. if you see something too often, you won't be able to pay attention to the little details. i'm a first time applicant too. i did a first draft of the essay for my advisor in December. Since then i've revised about 5 times drastically, and numerous times for minor points. i didn't have anyone read it after the inital draft though. mostly because it's personal stuff, and in the end, it is your decision what you feel is appropriate in the essay. i've a lot of experience in writing and editing. some people will only edit for grammar. others for content, and others for how it makes them feel. each person who reads it will likely feel differently about its various qualities. lastly, i would recommend not stressing about the essay. it needs to be a well-written, honest, piece of information that presents your individual voice. if it is, it won't be a deal-breaker. i also would not consider it a deal-maker, it is one piece of the puzzle.