Just back from the Towers and my opinion of Thirteen has changed massively. It was never my favourite coaster, firmly at the bottom of my favorite rides at Alton Towers along with Oblivion (it just doesn't do anything for me, sorry). Decided to give Thirteen a go on SRQ today and it's matured so well.
I was in row 5 and there was bags of airtime. Not quite Shambala but of that same vein. The lapbars seemed far more comfortable too. The outdoors bit was fast, flowing and smooth. Didn't need the kicker wheels at all. The indoor bit was the same as before but slightly lighter before and after the drop.
Operations were tight, 3 train service and no stacking. Proper job.
I just wish they'd keep the drop a proper secret. I was on with a group who had no clue about the drop and they were so amazed and surprised. None of the other vertical drop coasters advertise it heavily or at all.