The Nite Ize serves its role and I think it makes an excellent upgrade for actual indoor use... not just impressing the owner with scads of brightness but it is white, it puts out a usable amount of light and the cells last radically longer than the do with incandescent bulbs. I have heard the optional tailcap part is kinda cheesy. Kroll makes the de facto clickie for Minimags and there is a brand of minimag knockoffs called Quest available from ****'s Sporting Goods that come with clickies. They generally work very well... no play, reasonably stuff but not overly so. Out of the probably 30-ish that I've had, one had a dead clickie right out of the package and one died the first night of playing with it. But for the price, I can live with that DOA rate and they were replaced with no questions anyway.
I also recently had a TLE-5 module just to see what it would do. I had previously had the older low dome version and was much less than impressed. The newest ones have R-bin high domes (the same emitters that come in the Fenix Premium models) and I was very impressed with it.
From there, there are an infinite range of options from the Shoppe, Lambda's creations and many others. Still, I think my two favorites overall are the cutdown MJLED with a smooth on 2 Lithiums (though some versions may die on Lithiums) and a Nichia CS on a single 14500 LiON cell. I sand the LED gently and sputter the reflector. The result is basically just a large hotspot from edge to edge. VERY useful and gives unbelievable runtime.
I think these are among the most useful indoor lights providing a good deal of attractive and usable light and great runtime but if you were unhappy with the output of the Nite Ize, these are only marginally brighter if at all.
If you want bright, a Lux III at about 600 ma should make you happy. But runtime is less than great and it's gonna cost ya!
