I've got the Nyko charging station here... and yeah, the LEDs are pretty bright while charging, but that's the only bright colors I've noticed, eh. As far as the rubber back goes, it really isn't a problem for me. It helps as far as gripping the Wii-mote in general goes, seeing as I don't like the skin/cover things provided or that you can buy; however, I don't know that I can say that I even really notice it... seeing as how when I play a game, I don't much pay attention to the controller (unless it's a crappy knock-off that doesn't even come close to the feel of the original) so much as the game itself. I just wish I could charge the battery-pak by itself without rigging it up to the stand with tape and cardboard pieces... because I tend to forget to charge the pak sometimes and as a result... forced to use batteries, which I usually steal from my channel changer for the time being...
Anyways... Yeah, I use the Nyko charging station.