Overall texture quality and feel are great and I like the subdued glow of the semi-opaque sides. For the price, these are truly excellent. I do have two, fairly small issues with this set that could bring them from a 4 to a 5.
First, the clarity of some numbers and letters isn't great. They're readable, but the brightness varies and there are black omissions in the otherwise transparent lines of alphanumeric characters. Note how the lower half of the letters are dimmer than the upper regions, especially on S, E, D, and G. There are definite chunks out of # and %. I think there are chunks out of 4, 6, R, and D, but maybe that's "style." These issues affect all keys, not just those in the closeup of the keyboard.
The other smaller issue, is that I really wish the F keys would also have had their functionality in there, without the either/or proposition of Calculator OR F3, Mute OR F9. I guess that's pretty rare for any after-market keycaps I could find. This seems to be something primarily only offered with OEM and non-mechanical keyboards as far as I've been able to tell, so I don't really hold this against them.
For the overall price and quality, I'm quite happy with this purchase.