I will put my head up out of the trenches ( ready to dodge shots from the "traditionalists" hovering around* ;) )
Unless you have truly mastered* the art of temperature surfing ( and proven it with temperature reading checks) , then yes, a PID will improve the number of good shots* you make. It will also save you time and water that you normally waste trying to stabilize the temp .
.. If you are handy and confident with a screwdriver, PIDs are cheap and easy to install.
Alternatively, you could install a cheap digital temp probe* ( see "gronking")so you can actually see the boiler temp as it ramps up and down and pick the best point to pull the shot.
Having said that as a satisfied owner of a PIDd Silvia enjoying not throwing bad shots down the drain, i have to say i have my eye open for a nice quiet lever machine also . !!* ;) ;) ;)