I thought I'll start this thread so we can share our experience and give useful hints in one place.
I'll start with my experience concerning colour changer LED glow sticks. I have two of them King Blade x10 12 and LED Lumica Lumiace Colour Changer so I was able ot took couple of side by side pics:
I think King Blade sticks have been for couple of past years kind of mainstream product in color changer sticks segment. Cost is around 2600-3000¥. Lumica version I have was released this year. Both of them have same 12 colours. King blade is slightly brighter, but Lumica has special press and hold type of light booster button which makes it glow brighter then King Blade.
What makes Lumica really attractive is it's price ~1700¥. Build quality is in par with pricier stick, but you can see that light is not as smooth and unison compared to King Blade.
I had them at C-ute Nippon Budokan concert. With my average European male size hands I was able to hold them both in one hand quite comfortably. One warning though last row 2nd floor at Budokan is very dark place and 2 glow sticks together are really bright. It might annoy your neighbors. I guess it's less of a problem in FC sector close to stage lighting.
It seems that Color changers are very popular. It was so cool to see how entire arena switched colors when girls talked one by one during MC-s.