Hi Mike,

I don't have any experience with the 18lb 1200 you are talking about but I do have the standard 1200 and it has been a great engine....very reliable and very low fuel consumption. Some local guys have the wren's and the support they have received even over here on the other side of the globe has been excellent. I don't think you would go wrong with either engine. I would go with the simjet simply because of my favourable experiences with mine ( I also have their 3000 in an Avonds F15 also) but wren's support is hard to ignore also.

Best of luck,

Craig.