I have Performance Trends Engine Analyzer, I use it a lot, but I generally dont pay much attention to the gross numbers, as they are usually about 5% high, and Engine Analyzer is considered one of the most accurate. However, it IS an excellent tool for balancing static compression & cam timing to try to zero in on the maximum dynamic compression ratio that your local pump gas will tolerate, or seeing the effect a change will have on the SHAPE of the power curve, or if you want to go to a bigger cam but maintain your cranking compression, it can be a useful tool for figuring out how much to tighten the lobe separation. But as far as generating gross numbers, I dont generally use it for that.
The Drag Strip analyzer can be a very useful tool as well. Its very helpful for correcting raw track data for weather conditions. First I set up a baseline pass for a given combo on a given day. When I get home from a day at the track, I pull up that baseline pass, change the weather conditions in the file, then fiddle around a bit until the incrementals match up, print it out, write some notes on the hard copy, & store it in the log book. The print-out can be VERY useful at the track later on when you run into similar conditions, and its a really nice neat format.
To clarify, I do this process for each time slip.
