The Good: Every single thing about this stem is just the bees knees. I have only had a handful of sessions with this stem, but being as objective and critical as I can be...I simply cannot find a single flaw in this stem. The design is immaculate, and the process for getting a slip free grip is simple.
First a touch of medium strength Loc-Tite on all bolts and on your bars. A touch. This stem grips so well that you may not even need more than a drop or two.
1: Put bars in stem. Tighten a lil.
2. Line stem up on fork. Tighten a lil.
3. Take bars and "face plates"..if that's what you call them...completely off.
4. Lock stem down.
5. Now you are free to put your bars on. The reason you do this last is because you want to fully bring in the pinch bolts and the stem so you don't bend or bind your bars, bolts, and faceplates. The only potential for error here is that it is possible to bring in the pinch bolts so far that you may crimp your steerer tube.
The two centrally located pinch bolts do a wonderful job of keeping tight on the forks enabling the stem to have that rounded knee-friendly backside that everybody loves. Eastern has several stems with a single pinch bolt design and they flat out don't work as well as this stem does. You can read my review on the Deceptikon, and I also have one of their cheap stems with the same design (Dans sale for a whopping 15$). I wouldn't dare put that thing on any bike other than the one with single wall rims that I river jump with.
The Bad: Nothing. Nothing at all.
Alienation has earned their 70 dollars. The name drew me in because I'm a Maiden fan. I came for the name, I bought it for the design. Don't get too hung up on the name being shared with a heavy metal band, the name is a little more symbolic than that. This thing does everything you would expect from a torture device, it will lock on and never let go.