I actually think Explore Scientific supports their mounts a bit more than most other vendors. Their responsiveness in this forum is proof of that.
Explore Scientific iEXOS-100
William Optics SpaceCat 51 APO
ZWO ASI1600MM Pro, ASI533MC Pro
Canon 5D, T3i (Both Astro Mods)
William Optics UniGuide
ZWO ASIAIR Pro