This probably will go stone cold as it is Groupola but they do get it right sometimes and offer some decent offers and hopefully will learn from past mistakes. I don't mind if this does go cold if you can tell me where you can get better. I used STA as a student and found them reliable and competitive as did loads of others. This voucher gives you £100 worth of travel (flights, hotels, hostels etc) for £50 with no minimum spend required ie £250, £300. You can have a week in decent Amsterdam hostels for this for example.