I have two of the coolsky units, but both are white LED only, so I cant comment on your question about the RGB model. I'm very happy with the coolsky unit. They are relatively affordable, run cool and silent, and have no lamp to worry about replacing. As for the twinkle patterns, personally, I think only one or two of them are practical. Most of them are too 'flashy' for a star field. But there are a couple that provide a very nice 'shimmer' effect. I have mine set up so that some stars are on all the time on one illuminator and the rest of the stars are on the illuminator with the subtle shimmering effect. The result is a fairly natural looking star field.