BTW, some might refer to the head-fi.com forum, but I already searched and found little info there on the Stello HP 100.
Stello HP 100 Headphone amp
As I dwell in different countries during the year, I like the idea that this amp is switchable in international voltage. Would welcome experience with this headphone amp. In particular, its ability to drive headphones with more difficult load. Appreciate alternative recommendation as well. Thanks