1> The idea sounds cool, and they look great.
2> They cost a lot, IMO anyway.
3> The same quality machining goes into it as thier other stuff.
4> #3 is very sarcastic. I wouldnt have them change a plug on a Lawn Boy.
5> There is no service after the sale.
6> I have never seen an engine they built as a Crate style ever make the advertised power, or the power indicated on the enclosed dyno sheet. Ever. On several dynos.
It's up to you really, I wouldnt use them. Buy their parts, but have a shop that knows how to machine do the work.