I was just at Target and took a look at the Inova X5, X1 and all others.
I was not impressed with the X5, especially when it's $5 more than the brighter and more "everyday use" durable Brinkman 3W, 3AA unit hanging beside it. The Brinkman has a glass lens, great color, and very useful beam. Plus, it's super grippy.
Maybe if a car drove over the two of them, the Inova might hold up better. But I can't think of the last time I ran over my flashlight with a car.
Perhaps the Inova is too round, and will not resist rolling out into the street. :naughty:
P.S. the Inova X5 had lettering in it's tailcap rubber and a lanyard, therefore I assume it's the latest version.