Well, I just spun on my Everest 13-23 freewheel and the derailleur shifts just as well as with the Shimano 600...... I also tried the 5 speed Shimano with a 28t large cog but it did not like to shift on to the large cog. I have yet to try the Dura Ace 14-22 but I'm sure that will be fine as well. I think as long as I don't go larger than a 26t large cog it will work like a charm, though 23t will most likely be the lowest I go. As long as it is kept within the range it was designed to handle it works fantastic, and that is how it should be.