I use an oak and pecan mix.
I love pecan wood for cooking, it has great burn characteristics and flavor without all the harshness typically associated with Hickory. (speaking in BBQ terms right now)
I am truly jealous that I am not in an area where it is available. Hickory is even out of reach for me due to my geographical location.
Thank you for sharing your review on the SF oven, I am already doing my research to get one here!
I love this forum, great info with zero "holier than thou" attitude to deal with unlike a few other well known forums