Lockerz problem at the moment is that as soon as they replenish their stock, people immediately redeem items (and so they run out very quickly).
You need to stay up to date, know when they are re-stocking and get in there as soon as possible, although I think they have said they will get a lot more stock next time.
No, there are plenty of pictures and videos of people unboxing decent prizes (see video I posted).
The site has over 400,000 registered members so you can see how stock would run out.
I reccommend, however, that if you want something like the Xbox, the tele, the PS3....you get an amazon £300 voucher rather than the console, and buy it over amazon with a few gams