Somehow I forgot to share my thoughts here after my visit last week.
I guess my thoughts will pretty much echo Mark's. Tornado Springs is one of, if not, the, most complete theme park areas in UK. It has something for everyone - play areas, rides of varying height restrictions and thrills, eateries, etc. It's seeping with detail and theming all around. It is brilliant. Some parts feel a little cheap and bordering on tacky admittedly (the hay bales in particular feel a bit out of place), but that is nit picking.
Storm Chaser is a solid coaster. Not as spin-y as the other Mack spinner I've done, but still packs a nice little punch.
I think one thing that the area does highlight is the park's ambition going forward. High quality rides, with high throughputs. If anything, it perhaps overshadows the rest of the park slightly, and shows some of the shortcomings even more - especially operation-wise. Storm Chaser with its two trains can power through the crowds, but the rest of the park's coasters trudge on by. That's not a criticism per se, but it shows that the park have used this opportunity to level up.
I can't wait to see what the next major development at the park ends up being.