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That it is tolerable at all is because these are cruising boats, and you are not making constant adjustments like a racing boat.  Trying to race a boat with this kind of setup would be very frustrating.

The force vector from that block on its attachment will be directed downward and away from the mast at around a 45 degree angle.  The vertical component of that force will add to the compression forces on the mast.  The horizontal component will tend to pull the boom away from the mast.  When...

We just changed over our backstay cascade from low friction rings on the control line to ball-bearing blocks.  The two rings we eliminated changed the line direction a bit more than 90 degrees.  The reduction in friction in the system from removing those two rings is very noticeable.  Now that I...

In my experience, low friction doesn't mean "no friction".  Since you are using a winch anyway you should be able to overcome the friction and use rings, but blocks are a better choice for this application. If you are not using a winch I would definitely use blocks.  Pay attention to the...