I got the EZ Test Xtreme (or was it complete? - five or so bottles) from a hippy store in Leeds.
It's fine. I was worried it was shit at first because all the pills I was testing turned out to be piperazines (bzp, mcpp), and the liquid is already coloured when it comes out the bottle to begin with which confused/concerned me.
Also, it's pretty damn hard to actually just get a drop out of the bottles, you've got to really shake it.
Anyway, threw all three batches of those pills out and tested some that I finally got that smelt and looked right, and it went properly black with a hint of purple. Awesome.