Hi: Sorry I don't have any info for you either, but I just moved to Simi and am still going to West Hills for my Ob/Gyn as well, so I'm interested in responses, too!
Would Moorpark be too far for you? If not, I have a great OB and Pedi in Moorpark. The distance is probably about the same as West Hills, but Moorpark is probably an easier drive to make and it's mostly freeway.
Re: Recommend pediatrician & OB (or midwife) in Simi Valley