This was the closest box to my house and it turns out to be the best as well! I joined here, did my foundations and have been a member since 2011. I have visited around 15 other boxes both around the Valley and in other parts of the country and I am pleased to say that I like this one the best.
It is big enough to have a great assortment of gear and lots of space but not so big that you are working out with strangers or with coaches that don't know your name. A tremendous range of options (kids, endurance, refinery, self defense, etc) and lots of classes to fit into your schedule. Child care is also available, and I don't mean a little partitioned off space inside the box but a dedicated child care facility (lots of toys, kid's potty, etc) with staff.
With all of that going on it is still the least expensive box anywhere.
I have also been impressed with how everybody greets drop-ins. Since I have been the guy dropping in at other boxes, I am happy to say that our regular members are very welcoming.
3 ... 2 ... 1 ... GO!