We've hauled more loads with this than any other device and has always been happy with it. It is lightweight (for its pulley size), compact, and costs $80 less than its main competitor, the Petzl Pro Traxion. When this device first came out over a decade ago it revolutionized hauling. Suddenly you didn't need to spend time setting up a system with a pulley, extra ascender, and extra weight. Even better, this device freed up another ascender, which meant you could easily use the "space haul" method. It made such a big impact on the market that we have to be careful not to call all big big wall hauling devices "waul haulers"(Just like most of us ask for a Kleenex when we are supposed to say "facial tissue"). A decade ago this was unquestionably the best hauling device. Today it has stiff competition from the Petzl Pro Traxion and Petzl Mini Traxion.
For most big wall applications it is hard to beat this device for the money. If you are going to climb a ton of walls, are not on a budget, and want the sleekest device, get Pro Traxion. If you are just going to do some short walls and want a device that also doubles as a toprope self-belay device, get the Mini Traxion. But if you have a budget and want an all-around good hauling device, get the Waul Hauler.
Rock Exotica has confirmed that they have discontinued the beloved Hauler.