Well, my Unicomp Customiser arrived today. Unfortunately it seems that they were held up at Unicomp after running out of some parts or something so it took them three weeks to process my order. But anyway, now it's here, and I'm typing on it now.
It's an interesting typing experience. I haven't used a clacky keyboard in a long time. This feels pretty good. The tactile feedback is nice, though my fingers seem to be working quite a bit harder than they used to. Though, the last keyboard I was using was a Dell laptop keyboard...
As far as build quality goes, it's pretty good. It's heavy and fairly solidly-built, and it looks nice from the front. The key quality is alright, though it could be improved (there's a pretty obvious injection mould mark at the back of most keys, and the space bar has a very slight bubble in the surface. I also noticed on my keyboard the F9 key had become dislodged during transit, but that's probably FedEx's fault. Other than that, it's nice.

The only thing that seems a bit off, i'm not sure if the space bar is seated properly... it works fine except if I try to push towards the left-hand side of the space bar, the left part of the key moves downwards, the right part of the key moves upwards, and the mechanism doesn't do anything. So, how do I reseat my space bar?
Anyway, I might write up a full review later, if I get around to it...