Reading your comments it looks like you have already decided against them so why bother asking anything.
I've not decided, and don't need to. I'm not looking to get into mining in any way. I was worried about my friend buying a contract and wanted to know if they were as dodgy as they sounded.
It's too late - he already bought it - so I guess time will tell.
Sadly it's really hard to talk about GAW on this forum. I've seen users shouted down or called shills for giving positive reviews and there's a group of people who made a habit of coming here every day and leaving one or 2 flame posts with various invectives. I first came here to ask about hosted miners months ago and some of these posters were already here writing the same things they are now. The whole situation is unfair and a bit awkward.
My advise to you, don't even try going through the feedback. There are at least 2 spam/flame posts for each meaningful one. Find a roi tracking thread, where people compare payouts and calculate if the contract is profitable. My investment turned out to be, but it was over 3 months ago and the payouts have gone down since then.