Good, once you tweak it just right
I'm sure you have seen the reviews, on any type of motorcycle helmet headset... I even saw some reviews here on RevZilla about the Sharktooth... "It's not loud enough!"
Well, that's because it's not located in the right place. This system is no exception. You ***MUST*** have the speakers in the right locations for your ears, otherwise it will not be loud enough. And I'm not talking about just somewhere in the general vicinity of your ear, I'm talking about placement down to within 1/4" of your ear canal. The reason is because when you put on a good fitting helmet, it should leave no play between the foam and your noggin, so there is no air or space for the sound waves to travel around. The speakers must be located so that they can drive sound directly into your ears.
That said... the next part of this review is written with the Sharktooth fiited inside a Shark Evoline 2 ST helmet.
If you know about the ST helmet, you know it has pre-cut indentations in the foam core to place the various elements of the Sharktooth. Many people have said that the battery pack pushes into the back of their necks, and to them I say, you put it in the wrong place. There *IS* a pocket between the foam and the shell, at the center of the back of the neck, beneath the removable neck shroud. When you pull out the neck shroud, you will see the foam is cut away in a sleeve-tight space that you can slide the battery into. That puts the battery between the shell and foam, NOT between the foam and your neck. However... don't plan on getting it out again, mine was VERY tight! The only way I'll ever get that battery out is to pry it out with something. I have not tried, since I want the battery and wires to stay in one piece.
The real problem is that the ear pockets on each side of the helmet foam that have been cut out for the ST speakers are very VERY poorly located! In fact, for me, they were so high up that the speakers were pressing into the fleshy cartilage over the top of my ears, so there was no way to get sound down into my ears. It took me a while to figure this out, and I was experiencing that same "it's not loud enough!" problem. However I did figure out the placement that they should be using some creative ingenuity, and I then set to figuring out how to move the speakers down to the right place. I ended up having to create a new indentation lower down in the sides of the foam to hold the speakers at the right locations for my ears. I would have liked to have brought them down even lower than I did, but I had to set them so low that the chin strap was in the way so I could only move them down so far. Total move was about 1/2 - 5/8".
So, a few minutes with an exacto knife later, I now have properly located the speakers to my ears, and I can confidently say that it is definitely loud enough. I might make a few minor tweaks if I can, but for the most part, I've got them as low as they can be with the chin strap holes.
If you are going to install this system in a NON "ST" helmet, you will probably be able to do the same thing... find the proper locations for your ears, make the appropriate indentations, and then you can set the speakers in the right places to be plenty loud for all your needs while riding.
ELECTRONICS AND FUNCTIONALITY:
Thus far I have only linked the unit to my cell phone which provides GPS and MP3 as well as phone. Operation of music is limited but easy... a simple double-tap on the center button starts and stops music in a jiffy. Single press brings up voice commands, which is horribly unusable for me, on any headset. Stupid phone NEVER EVER EVER gets the commands right, but that's a bad voice recognition software, not a bad headset. In-call clarity is fine so far. Not that I make a lot of calls while riding, heck I make a point to not do calls while I'm driving too. But i have wanted the nav system audio, and i might do music from time to time... and who knows, maybe there's an emergent call I need to make for some unforseen reason. So, back to functionality... it's a very simple design, only 3 buttons: volume up and down, and a multi-function button. Maybe I'll figure out some crazy hidden button combination technique to get it to do other things, but for now, it's simple.
I give the Sharktooth system 4 stars because it is a little on the simplistic side functionally. I would like to have more control over music, such as skip and back. The system si loud enough, so that's fine. And I can't blame the Sharktooth system for the pre-cut holes in the helmet. Tho I will knock one minor bit off the score because with as much ingenuity and thought Shark put into the overall helmet design, they didn't really spend as much time on the considerations of different head shapes in terms of placing the speakers.
I'd still like to see a maplight! Hey Shark, why don't you integrate a maplight system into this system? That should be easy enough.
I have recommended this to a friend, and I will again too.