Given that my last post (see "where the .... am I) was a tale about how I got confused about my position I almost hesitate to comment here, but here goes. I think that the whizz-wheel is a good tool for pre-flight planning if you are still pursuing the 'steam-driven' approach and also a good device for helping to teach the principles of navigation. I still do my pre-flight planning using one and, as long as the wind forecasts are reasonably accurate, is an enjoyable and satisfying process.
Arguably, one of the reasons I found my self in the ordure was that I hadn't done any planning and simply relied on my knowledge of an area I know well.
However, I seriously doubt that I could use a CRP-1 in the air with any degree of confidence - too much like riding a uni-cycle, blindfolded, around the rim of the pit of doom whilst reciting one's times tables.