I have a 2-mile daily bicycle commute that gets a bit boring, so I was excited to receive the Tunebug Shake as a birthday present. Unfortunately, I experienced the same problems - plus some - as Richard, another reviewer.
First, the sound quality. I watched the video on the Tunebug website for helmet positioning and did the same. I also tried a variety of other placements, as well as trying different strap tightnesses. The sound quality is great - in my 8' ceiling garage. As soon as I'm out on the road with wind in my ears and cars going by, it fades to so quiet that it's hard to hear. If I'm listening to a song I know, I can follow along fine, but new songs are essentially incomprehensible. I tried listening to a podcast for about 10 seconds before I gave up - understanding only every 5th word doesn't make for a good listening experience. Turning the volume up, unfortunately, is no cure. When the volume is at 100%, it sounds like a badly-tuned radio, full of static.
Second, the spotty Bluetooth. The human body is comprised mainly of water, which absorbs radiation, including Bluetooth. So it's not really that surprising that the signal from my pants pocket to the top of my head - basically the widest cross-section of the body possible - would not work so well. It's particularly irritating when pedaling - at the top of the stroke, my leg is close enough to my head for some audio, but when I push down, I get a drop out. Tunebug includes an audio cable, which I attempted to use, only to quickly discover that it's much too short to run from the top of my head to my pocket. I guess they expect only shorter people to use this cable, or people who keep their phones in a breast pocket.
Third, the battery. This is what pushed me over the edge to return the product. My ride to work takes 15 minutes. The ride back, 10. So I think I used the thing for a grand total of 45 minutes. It sat inside for a couple of days when it was too hot for the bike, but it wasn't on. Nonetheless, the battery died after about 30 seconds of audio. If it hadn't taken 6 hours to charge to begin with, I suppose I wouldn't mind so much.
Last, the controls. They're capacitive, not real, buttons. Which, again, makes some sense - you don't want the strap pushing the buttons on top of your helmet - but irritatingly, every time you try to move the device around on the helmet or adjust it, you end up either turning it on or turning it off by having your hand near it. It's just one more thing they apparently didn't think through very well.
Overall, I'm really disappointed. I had hoped to enjoy podcasts, or at least music, on my way to work while keeping my ears free for music. Like Richard, I'll have to keep looking.