I use Gold Mount, which is really useful as, again, since the sled is so light, I'm better able to balance larger builds.
I believe Tiffen created the Aero as a replacement for Zephyr, although it was manufactured overseas (hence the price differences). Both of them can carry 20lbs+ camera payloads with no issue (Tiffen-recommended max for Zephyr is about 3lbs more than Aero-30), so your camera and lens combos should be no problem.