Anyone used Rockgardn Flack Jacket?

I have been considering a tekvest for snowmobiling and dirt bike riding. In my search, however, I came across the Rockgardn Flack Jacket, which looks to me like a better compromise for both sports (cooler in the summer). Check the extra pics to see the back protector that is included. Has anyone used one? If so, any reports or comparisons would be appreciated. A link to the jacket I'm describing follows:

http://www.rockgardn.com/Browse_Item_detai..._1/75631#ITEM_1

Thanks