They list the benefits here: http://liquidpiston.com/technology/engine-benefits/ http://liquidpiston.com/technology/engine-benefits/ Last time this was discuss

They list the benefits here: http://liquidpiston.com/technology/engine-benefits/ http://liquidpiston.com/technology/engine-benefits/ Last time this was discussed, the power density was listed at the most interesting feature. Also that apex seals are in the casing instead of the rotor, which I think some speculated could help with wear/maintenance.