Hmmmm. It's a tricky one.
Those concepts really do look incredible. There's such a high amount of detail in them, which would really have conveyed a story and created an atmosphere. It all looks very Bioshock-esque, particularly the pipes and syringes on the Marmaliser with it's glowing green and purple colours.
However, I'm not sure this is the sort of ride I'd like to see at Towers. Don't get me wrong, I love the concepts, but I'm looking at those images and I'm not seeing an Alton Towers ride. I'm seeing something for a Thorpe Park style attraction.
I've said it before, and I'll say it again, Alton's rides have always had that rather camp, over-the-top nature about them. It's what makes their rides and attractions so unique. For me, The Smiler in the form we have achieves that a lot better than the vibe I'm getting from those concepts.
I'm not saying the The Smiler we have is perfect. No, there is a lot of work and changes which could be made, and it could have been far better than it is. However, I wouldn't really change the direction and basis of the theme which already exists. Not for the above anyway.