Firstly, the tube is much much bigger than I thought it was from the picture; roughly 180mm tall and 20mm wide tube. It's brilliantly sealed and very easy to use.
I used this to fix the glass screen on my Samsung S2, just removing the old broken glass and sticking down the new glass (Saved me around £80).
I bought a portable UV light which I used with it.
The glue comes out of the tube very easily if you push the plug at the top, otherwise for smaller drops squeeze the tube; it's a very tough tube so squeezing only brings out a small amount.
The only other thing is that I couldn't tell when the glue was hard, it happens so fast and there is no indication, so make sure everything is in place.