I have bought two tickets to see Pink at the O2 for her 25th Apr show. The tickets arrived promptly and I never had any worries whatsoever as to the validity of the tickets as I was informed that the tickets were on hand and ready for delivery. The customer service staff over the phone were also very friendly and helpful. My husband and I had an amazing time at the O2 last night and the seats we got were awesome! I have purchased another set of tickets to see Beyonce on Saturday! My only regret was not knowing about them before as this could have prevented me trusting another website (which had really poor reviews and bad reputation for customer service -- my fault, as I did not do any research prior to booking tickets on their website) for concert tickets. Can't wait to receive my Beyonce tickets soon!