Pros: Effortless sounding - generous but tight bass, liquid mids, smooth yet energetic highs, and a holographic soundstage
Cons: Single input only so pre-amp use would be limited, probably can't drive an HE6 very well
See my detailed review here: http://www.head-fi.org/forum/thread/561463/review-analog-design-labs-svetlana-2-tube-headphone-amplifier#post_7588283 In summary, this world class SET amp is a brilliant choice for someone looking for the benefits of classic tube sound while avoiding the traditional weaknesses. The manufacturer has been around for a long time in Korea but is just now starting to expand to new markets. Highly recommended.