I have a warning about a Neewer head I bought a couple years ago--the AS clamp was not to AS spec and it didn't close enough to actually hold half of my cameras. The monorail on my Arca Swiss 4x5 would slide right through with the clamp tightened down all the way. It also would fully hold any A-S, RRS, Kirk, or Sunway (another chinese brand AFAICT) clamp tight. That one ended up in the trash because the first thing I attached held fine, and I was past the return period when the flaw was discovered. I also had a very short lifespan on a Benro tripod recently, though their heads may be fine.