A number of Euro brands use the Lambda, but it's hard to keep up with which are being imported. Eric may chime in because he has been (and is going again soon) to Europe for one of the trade shows......But, It appears that the Frohling at Bioheat uses it. And being as that importer has a 30 year history here - that may give an edge over some other importers that may have started up this year. Here is some info on the processor: http://www.atech.si/index.php?page=10&lang=2 Lots of boilers without this fancy new control work very well.....especially with good wood and tied to storage. In the end, I think there are a number of factors which will go into your final decision. As to the continuous evolution, keep in mind that we sold the TARM system in about 1987 - and it was highly tuned. I think it can be accurately stated that the Lambda is really the only major potential evolution since that time. Even the TARM was largely based on the HILL and KETT (Jetstream, etc.) boilers from the late 1970's. We had very little innovation in biomass boiler in the USA from the mid-1980's until after 2000. In fact, it could be said we went backwards with tens of thousands of OWBs being installed.