How is the volume level on these? My biggest problem is that I just cannot hear anything if there is any wind noise in my helmet, which is most of the time. With the SENA20s, all three of us spend a lot of time saying, "What!?" So it is not just me being hard of hearing. Even the kids have issues with it and we are always careful to make sure we have the mic directly in front of our mouths.
The short answer to how the volume is, is that it is pretty good. The longer answer is this:
I use mine on two different helmets (Bell dirt helmet, and Bell mid-range street helmet), and I use them while riding 3 different bikes (Super Tenere, KLR, and KTM). I use the boom mic on both helmets.
On my Tenere while commuting, I can carry on a phone conversation at 90-95mph and people don't know I'm on a motorcycle. I can hear them clearly and the volume is not turned up to max. While commuting I don't usually wear ear plugs as it is only 20 miles each way. Music while commuting is usually not turned up to maximum but it is pretty close. If I listen to a podcast, they are turned up to maximum and can be clearly heard up to 60-65mph. After that, they are 50/50 depending on who is on the podcast and how boisterous they are.
On my Tenere while touring, I wear EarPeace earplugs and can still hear music just fine but it is turned up to maximum. Podcasts above 60-65 mph become closer to 95% not being able to understand them. As for comms while touring, hearing Rachel is a little rough because she didn't use the boom mic in her helmet and she has a tiny head. So she has to speak up in order for me to hear her clearly. Keep in mind, she using a boom mic while in her dirt helmet and if I don't remember to turn my volume down, she blows my ears out when she first cues up her comm when we are riding dirt. I have no reason to believe that her street helmet would be 10x better if she swapped out her microphone to the boom mic. She reports being able to hear me just fine at all speeds (she also wears EarPeace ear plugs while touring).
On my KLR, everything is fine as the speeds don't ever exceed 65-70mph. I can hear everything just fine and people can hear me just fine.
On the KTM, they are amazing. I'm so glad we use them. We can hear each other clearly, and can communicate how we are doing on a trail. I can even hear when she crashes which tells me that I need to turn around.
Please keep in mind that while I use them quite a bit, my experience with different brands is fairly limited. So far my communicator experience goes like this: Chatterbox GMRS units, Scala version 1 or 2 of their communicators, and now these. I've never had any of the Sena communicators, or any of the China branded ones.
I hope this helps!