I've never tried WST but when I was at a steel plate shoot in CT last month, there were a few USPSA shooters there and this guy was using 147 gr blue bullets with 2.7 gr? of WST if I heard him correctly. WOW, he was blazing fast in shooting down the plates. He was using a glock and it looked like he was shooting a 22. There was basically zero recoil which allowed him to transition very fast. He wouldn't tell me what they were chronoed at, but my guess is that they were definitely below power factor (which didn't matter as they weren't chronoing loads at this steel plate shoot). He had no issues beating guys with fancy open pistols with optics.
Anyway, didn't mean to derail the thread. Just wanted to note my observations of WST.