I have just owned this product for a few days only. I have some comments to say: Pros: Great design idea. Upgrade your QC25 to wireless with just a fraction cost of QC35. Easy to control volumn and answer phones. Sound quality is good. Cons: No battery life indicator There are cuts of music from time to time, I don't know if it is from interference or not. The charger is the dedicated one, so if you lose the charger you will need to buy a new one from the seller. You cannot use a mini USB charger instead.
Update of the review: After using it for around a few weeks, I determine that this product has defective function when connecting to my iphone, because there are always cuts while listening to music. It is quite annoying. So I have to give 2 stars for this products.