I've jumped at the other places in the valley and even in the Seattle area and had the best experience at Skydown. They are equiped with a bigger plane all year round which makes the ride up much more comfortable and the exit a lot easier.
I've brought friends and clients out to do tandem jumps. Their video crew is simply amazing! Skydown accomodated us at night for a sunset jump when no other drop zone would.
The people are very informative and willing to help. Their contageous excitement and eagerness to jump makes this the best drop zone in the valley.