Fantastic Philip, the MSM range is terrific and priced well. The packaging is terrific and its great to not have the worry of cast iron castings rusting.
You're on a slippery slope now and I'm sure you'll be adding more MSM engines to your steam stable 
Thanks Jim, yes i know that as i've just ordered a reversing Pevensey engine to keep the Tyne company!!!

I think the fact they use Gunmetal for the castings is a huge plus over Stuart's iron based offerings, especially for those that like running on live steam.