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The deluxe has internal baffling which in my exp results in better contrast, i.e., less reflections and stray light compared with TV, shorty-plus or any other barlow i've tried. (I guess this is especially true if your scope’s baffling is less than ideal to begin with as all of mine are.) It is also a longer barlow than most which makes it better at producing flat and aberration free field. If you use it with cheap widefield EPs on a fast telescope, the improvement you get in edge of field performance is remarkable compared with other barlows. On the other hand, this also means that the deluxe needs a lot of focuser outward travel and so it may not reach focus with some telescopes with limited focus travel (eg some refractors,. Cassegrains with fixed mirrors fitted with external focuser).
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