I have a Kurt Kinetic trainer that I use for most of my interval training. I don't have the funds for a power meter but I noticed they have a power computer which convert speed to watts. I've know watts are more accurate than heart rate because the heart doesn't give immediate feed back. The pdf file they show on the site has hugh jumps in watts from one speed to another. So my question is if anyone is using this or something like it in their training?