well i don't clamp them down tight at all. I know the air clamps work well enough....but after i lock them all in with air clamps, i snug down on the manual clamps a little as a "just in case/anything can happen" scenario....after I air clamp everything i turn off my air compressor due to how loud it is and there is no relocating it.
those blue ones feel much better to turn, much better style of knob. If anything I'd like them to just make my press look that much better and everything consistent ya know? The ease of use is much much greater.