anyone that is floating through here looking for reviews, here is one.  My experience and my opinion.  I purchased two helmets, both M1 EVO, one medium and one large, also purchased a set of Bikom 20.  I have been mostly happy with the products UNTIL.....the adjustment buckle broke on the medium helmet after only a few uses.  it is a known problem on their helmets, and would be covered under warranty since I purchased them only a few short months ago.  I sent a request, we had some discussion, they asked for photos, SN and such, normal stuff.  sent all.  15 days ago they said they would send an RMA but I would have to pay for shipping to return.  that is disappointing, but I don't have a choice, the adjustment is important for both safety and comfort.  two weeks later, I am still waiting for an RMA and an address to ship to.  no response, have tried several times to email and message through the website and no response.  I have decided to sell these on FB marketplace and go with Cardo on a Smith Helmet.  it is easier, and the reviews on their sites say they have a great warranty dept.  I highly recommend you go elsewhere, SENA is un-responsive and dont stand behind their products.  very disappointed.