The only thing about Lehners sometimes is the odd shaft sizes they use on certain models, but so far as quality and power, they are amongst the best on my side of the pond.
IIRC, I saw graphs on their website, some setups were producing 95% peak efficiency, Neu's I think are around 92% peak efficiency... every percent higher makes a big difference as far as heat/temps is concerned. Don't quote me on that though.
“The modern astrophysical concept that ascribes the sun’s energy to thermonuclear reactions deep in the solar interior is contradicted by nearly every observable aspect of the sun.” —Ralph E. Juergens