I'm single, and almost always fly solo, but occasionally fly with passengers.
The visibility out of the canopy of an RV-8 is absolutely superb, even from the back seat, completely unlike a non-canopy, highwing tandem aircraft like a Citabria or Cub/SuperCub, etc. The amount of "elbow room" in the rear seat of the RV-8 is also better than the side-by-side RV6/7/9 models... I've flown in 6's and 7's with two aboard and unless both occupants are skinny, it's a bit on the "cozy" side.