Here's my red keycaps on a black 87UB. I apologize for the cell-phone quality pics, it's all I've got with me.
Overall I think they look great. Although, I did notice that there seems to have been a mistake when they were printing these. In the factory key set, you get 3 CTRL keys (2 are 1.5 size, 1 is 1.75 size) and 2 CAPS LOCK keys (1 is 1.5 size and 1 is 1.75 size). In this stock set, none of the CTRL keys have a clear window to see the LED through (because why would you need to on a CTRL key) but both of the CAPS LOCK keys have clear windows on them so you can see when CAPS LOCK is turned on.
However, in my set, I received 3 CTRL keys, all 1.5 size (one of which has a clear LED window) and 2 CAPS LOCK keys (1 with a clear LED window and 1 without), both 1.75 size. Additionally, the CTRL key that can be swapped out with the CAPS LOCK key is the only key switch on the keyboard that has a horizontal indexer, instead of a vertical indexer (see pics below). I'm not sure if there's any way to get this corrected but it sucks if you want to swap the CTRL and CAPS LOCK key positions.
This first pic shows the different orientation of the indexer between the windowed/non-windowed 1.5 size keys and why I can't attach one of the non-windowed CTRL keys to the key switch:
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Here's the key switch:
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Here you can compare the red color of these key caps. On the left is the red ESC key that came with the keyboard, on the right is the red ESC key that came with this new set. The red on this new set is slightly lighter in color than the red on the original ESC key.
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Here is the same red ESC key (left) that came with the keyboard and on the right is the keyboard key from the ROUND 3 Cherry key cap group buy. The red on these two is very similar.
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Here are a couple of different color combos I tried, first mixed with the original Black/Dark Gray modifiers:
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Next with the complete swap:
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