We had the wired Eartec. Sound quality was very good. Battery life was abysmal, as in we had to make sure they were charged every time we used them. Headset was featherweight. However, if the coax plug popped out slightly, the feedback screech was horrifically painful and we lost communication. The wireless of course wouldn’t have this issue.
Our first set of Sena Expands had ok to not so good sound quality largely due to the mic picking up virtually all background sounds and amplifying them as loud as speech making for huge amounts of static. As bad, the plastic headpiece bands on both broke in several places making them useless. Sena did replace them out of warranty after my wife complained on FB. The replacement itself didn’t go smoothly as I had to work through regular customer service channels explaining over and over that the company VP said on FB they would replace them. After a month of sending them photos of the units, serial numbers, FB screenshots, they then told me I had to mail the old ones back, on the other side of the country. I crammed them into the smallest USPS box that would fit and sent it as cheap as possible. That’s just a rant. They did replace them them two years out of warranty.
The next set have much improved sound quality, battery life is excellent. We make a deliberate effort to gently put them over our ears so as not to break them and after two years, still good. I needed the manual to pair them but once done we just turn them on, check battery level by number of light flashes, push a button and they connect.
Unlike the Eartec, I’ve paired the Sena with my phone and they can also pair with other BT audio devices if one is so inclined. They are lighter than the Eartec wireless and you can readily hear ambient sounds with the open air style. The Sena are firmware upgradable plugged into a laptop but, we’ve never done an update that had any noticeable change.