For most applications I don't think that it's worth the large resource hit for what's a relatively small (if any) improvement from what I've seen. Again, it's surveillance video. You're not making 4K documentary films (and the lenses, et. al. still kinda suck independent of the sensor so...). As long as it's good enough, it's good. Granted there are some specific cases where the higher resolution could be useful. For general use, the 5231 and other 2MP Starlights still seem like the best bang for the buck to me.