Just like to share some personal experience with the Tenore. I received my set about a week ago and was really anticipating to found out if my pair was of the "Bass" or "Flat" version as per many comments on this thread. Well on my first listening session I was pretty happy with the sound until I tried a song that I like a lot. The song is from Anathema Hindsight album - Leave No Trace. The song have a good acoustic drum bass impact and the Tenore connected on my iPad reproduce that bass somewhat to elevated that it was messing the balance of the song.
So I decided to let them burn for about 3 days and today I tried the same song on the iPad and to my surprised the reproduction was much better. The bass drum is present with good impact but it doesn't sound overloaded anymore and they entire presentation is balanced from low to mid to high.
Also today I heard the driver flex noise (left side only) for the first time. didn't have any before burn-in. I'm using the Heir Audio grey&red tips.
So far for ~$60 I'm pretty happy with the performance of this Zero Audio product.