RCT stand-ups suck! If you use the regular 2-across stand-ups, they are way too intense and can't be built very high either. If you have CF or LL, then they are good if your using the steel twister coaster. That way you get more banking on turns, and you can have more inversions for some reason. So, maybe people who say they are bad are owners of only RCT, not CF or LL.
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Do your own homework!