I am debating whether a set of GND filters will be a worthwhile investment. What I am looking at is the LEE system. The holder, adapter, and both the hard and soft GND sets (each includes .3, .6 and .9 filters). This would run me $668. Right now I just have a few screw in filters. I do a lot of landscapes and typically just use a circular polarizer. What I am really wondering is if the filter set would be a substantial improvement over just taking and combining multiple exposures.
Also, if I were to only get either the soft or hard GND filters to start with, which would be a better choice?