I've been taking my children to Pediatric Associates in Ellicott City for close to seven years now and have never had a bad experience. Our primary pediatrician is Dr. Leffler who is personable and intelligent with a great manner with kids. One of my children has a rare medical condition and Dr. Leffler has stayed on top of his treatment and referred us to wonderful specialists when needed. Over the years we have seen every doctor in the practice and I've been impressed with all of them. It took us some time to warm up to Dr. Cahill. His bedside manner isn't the best (although it's not the worst either) but he has an innate sense for diagnosing problems that is really amazing.
The office is beautiful--big reception area, separate waiting rooms for sick kids and healthy kids, and another one for teenagers. I've never been kept waiting for long. They also have a nurse help line that you can call with any questions, no matter how trivial (really good with a newborn or when you just aren't sure if your child's illness warrants a doctor's visit). The office is just off of Route 29 and Baltimore National Pike in Ellicott City so it is easily accessible from Columbia and western parts of Baltimore County.