I have an older style Inova X1 (v.2), before they recently put the more powerful LED in it.

There should be about three versions of the X1 floating around:

version 1 - spotlight beam.
version 2 - flood beam.
version 3 - latest model, more powerful LED, less battery life.

Also, some folks (myself included) have noticed that the light will flicker because of bad contacts. A little sandpaper to take off the excess anodizing fixed that, although the momentary on switch is still temperamental.

Still, it's a nice light, especially for the price. I haven't tried the v.3 latest model. The folks over at Candlepower Forums can probably provide more info.

Here is a link to Flashlight Reviews and their opinion of the X1:
Review of X1