In reply to Swig:
No I haven't. I didn't slate the guy, I slated the recommendation. The conditions in which he bought his (assuming he has a set) and the conditions our O.P would buy them are completely different. Buying used micro gear (especially cams) for a lot of people is a huge no-no but aliens seem to get a let off here because they're not making them anymore.
I believe to recommend a product, that 1) You'd have to buy used. 2) A company that's had it's Q/C issues and is being sol 3) Are really hard to get over here/most likely shipped in from America via personal shipping to someone unaware of all these issues is on the wrong side of irresponsible. I was harsh but not unduly so. I believe if you really think that the O.P should buy these then you wouldn't neglect mentioning these points (if the positives truly outweigh the negatives).
In your view Swig is it worth it? If so just say so.
"*with the caveat that mine were bought well before the quality-control issues and have been fall-tested a number of times."
"aliens are v.good in the small sizes. Not sure if you can get them anywhere in UK, prob have to get them from states. very flexible and small heads. often see them 2nd hand on ebay."
The people who've said they're good but mentioned that they have real issues unique to these specific cams (as above) are being honest and giving a fair (not obscure) picture.