I was very eager to see a neckband version of In-Ear headphones from Sennheiser.  Its not a common combination.  It satisfies two of my needs.     1 - During exercise the band keeps the buds in place comfortably.  I have tried units with ear hooks, or longer silicone ends like triple inserts for swimming...  The neck band keeps a slight pressure on the ear buds so that they stay in place and maintain a good seal.  As an experiment I tried my Etymotic silicone inserts, which improved the air seal, but became uncomfortable over time.  But the...