Looks like a good one to me. We got some cheap ones from a local retailer a while ago and they are still doing fine even long after the labels fell off. From what I understand, the helmet will block all UV light whether it darkens automatically or not. It might be annoying that you get a flash in the eye, but it *better* not cause any eye damage. If it does, its not made according to the standard it should be. If you think about it, there will always be a tiny fraction of a second where a flash gets through just before the screen can darken. If that was causing damage, I'd be blind by now LOL
Having adjustable sensitivity is also a good thing. I found that sometimes switching to different lighting or trying to Tig weld after Mig welding caused the automatic darkening to hunt between on and off (VERY annoying!). Turning the sensitivity to high eliminated that problem. On the flip side, if you have a very well lit metal piece that is reflecting a lot of overhead lighting, it may darken before you strike the arc making it hard to find your starting point (distance between the surface and your helmet will also affect this), which is where the low sensitivity comes in handy.
Once you get an auto darkening helmet, you'll wonder how you ever got by without it.