Very nice cutting. I use spiral blades when I feel they are appropriate. When I do use them I use the Flying Dutchman 3/0 New Spiral blade, most. My second favorite one is the 2/0 Pegas spiral. Both are small blades. I use them when a board is too long to turn on my saw. When I can, I turn the board in the direction I am cutting just as I do with a flat blade. I have better control that way. In the places the board can't be turned I than cut with all directions with the blade. I also use the spiral in very delicate work because I can use it sorta like a file and carefully cut/file wood away. They are also very good for "veining" because they make a little wider kerf than a flat blade.
To me they are another tool. They have their place and it is well worth it to me, to be able to use them. Takes a little practice, is all.