I recently purchased a Viper Vengeance helmet and I am quite happy with it. It looks and feels very nice. The only problem i had with it was the fact it felt a little too big for an x-tra small. Other than that, comfortable and good looking.
The Z1R Viper Vengeance gained my attention based mostly on its sale price. But further research revealed what an excellent reputation Z1R has built based on its superior crash safety ratings. I had heard and read that they tend run a little small in size, so I got an XL where I normally would go LG with Bell, KBC, & Azonics. Only real Issue I had was the lack of a wind/chin curtain at the lower/front which helps with wind turbulence at higher speeds. Z1R has this Item as an option for around $10 and fortunately Dennis Kirk had it in stock where many other online motorcycle supply houses were O.O.S. IT's fairly easy to swap out shields, which I did, installing Z1R's Blue RST Mirrored shield. I believe that a chin curtain should be standard equipment, but all in all a well built, good looking and fitting helmet at a nice price point. Also, you can take care of and polish your helmet with the cool helmet bag supplied.