These headphones are exactly what I needed. I tried 2 brands previous to these and found they fell out of my ears with just the slightest provocation due to the weight of the microphone box, even when using custom foam ear inserts. I have had no such trouble with these earbuds, and I have done everything short of run with them.
The neck piece is comfortable and light enough for me to forget it is even there after about 10 minutes. The controls are easily accessible and intelligently placed: once you learn what is where, it is hard to accidentally press the wrong button.
Range is great, about 20-30 feet at full battery, and even works through cinder block walls, although that lessens the distance. I wear them about 7.5 hours of my workday, and I have never needed to stop and charge them at all. The battery life is incredible. Sound quality is great, but a real audiophile would be pleased, but not impressed.
Overall, great product, easy, comfortable, long lasting, and perfect for everyday use. I love them.