There were 5 of us sisters from 3 different states, with 1 day to see as much of LA as possible. Yuriy, our driver/guide, did a great job of showing us the city. He picked us up timely and took us wherever we wanted to go, all the while driving smoothly (we are SO glad none of us needed to drive in LA traffic). We enjoyed "playing tourist" in several popular areas - downtown LA, Grauman's Chinese Theatre, Dolby Theatre, Griffith Observatory, viewing the Hollywood sign, etc.
Yuriy was very knowledgable and had a good sense of timing, never hurrying us and willing to wait longer when we needed more time for pictures or exploring, but still managing to show us a great variety of areas in our planned 8 hours. He filled slow traffic time by playing several videos (2-5 minutes long) in the vehicle that were both entertaining and informative.
For a group, a private tour is the way to go - flexible, efficient and tailored to your taste. We all would highly recommend Yuriy for such a tour.