I much prefer Golden Cheetah to WKO5, but both can be used to accomplish basically the same data analysis. However, I dislike WKO5 based on the fact that the devs think they know how to look at my data better than I do. No real comparison window, forced smart segments, data filtering, etc.
But for most of TR users, understanding the CP concept and adding 1-2 max efforts at 1-3min (for MAOD) and 12+ min (in addition to a ramp test for MAP) would alleviate lot of the confusion about FTP. Dr. PF Skiba even released a spreadsheet to do simple CP analysis and performance modeling with Banister’s IR model.