I would not touch them with a barge pole, while there may be many happy poeple with tickets, there is no way of gettingany come back on them, you don't even know where they are and if they decide not to send you the tickets, or go under then apart from not knowing where they are and how to seek redress, you also have no other protection.
They are also in breach of distance selling regs and deregistered from e-bay, so very risky.