I've had my Flash II for uhh 6 or 7 months I think.
I use it mostly as a food knife and carry it daily as my plain edged blade (my other knife is fully serrated) on my off (left) side. The assist is nice to have on my off hand, I know that I can get it open without having to concentrate on it with either hand.
The main reason I got the knife is to see how I liked the slide lock. I do not like liner-locks or lock backs for various reasons and the lock on the Flash has proven to be just as good as my blade-lock and axis-lock knives. The semi-auto feature and the lock effectively hold the knife open or closed.
The blade is a fairly standard shape and comes with a nice edge from the factory. I keep mine extra clean and use it mostly for food prep and while I eat along with occasional work where a straight blade is preferable over my serrated "working" knife.
The plastic handles aren't all that nice, but they have a nice shape and adequate grip. Let just leave those rated as : Nothing special.
The assited opening is smooth and works every time. If auto's aren't legal in your state (like mine

) , this is a good alternative. I pull the knife and shift the blade under 1/4" and its good to go. I know if I eve to deploy my knife NOW this is a solid 3rd place behind autos, and fixed blades, it will be ready when I NEED it. Use it to intimidate or impress sheeple as desired.
Really the only thing that I'd like to have for the knife is a 'wave' feature where I could just catch the blade on the edge of a pocket or sheath and touch off the assited opening. Perhaps for the Flash III.
For $50-$70 (can't recall what I paid) this is a wonderful knife. I wish I held out for the Rainbow one with aluminum handles, oh well.