TBH I used it for about 10mins at Armo - not because it was rubbish, but because I had just bought the Axe and was having fun with it.
The trigger on the Alien is VERY good. Uncapped, I can hit some pretty decent speeds. At first I thought the Hatred board would cause issues as I am used to OLED boards, but it really is VERY simple to program. The build quality is what makes it good. It is modular so you can air it up when it is in pieces to troubleshoot leaks. VERY simple to maintain - not many orings. Jack (owner of Alien) said it needs maintaining about once a year... and then that is too much.
I keep going "sell it" - then "don't sell it" - flipping my mind :/