Not so much has anyone gone to the effort ... more has anyone been prepared to risk their engine with new technology! They look good, have been tested at high rpm (11,000) and power (1000hp) the only element missing is longevity - if I were in the market for one (to be honest I'm not) I would like to see a few engines that have done 10,000km or more on one. Plus 450 pounds sterling is a lot of dollars!