Rode it for the first time last year and it was horrible to be honest.
A very rough and unenjoyable experience, which is a shame because the layout is actually not bad at all, although I prefer a big drop instead of a turning drop following the chain lift. And the second worst thing about this coaster is the operations. With a small queue line (20-30 people ahead of us) it still took SOO long for them to send the train away from the station. It was ridiculous.
I just don't really see a reason for me to go to this place again instead of Liseberg. The park is just miles behind when it comes to the general atmosphere, theming and ride operations. The ticket prices are fairly similar too. Like someone said in a previous post, it may be unfair to compare them because of locations, but it's not far away from the capital city.
Balder > Thundercoaster
Helix > Speedmonster (Although the launch is better on the latter)
A better logflume, and a better collection of flat rides.
This is not meant to bash the park or anything, it's just how I feel about it.
Give TC the RMC treatment and I'm there! Just a renovation, not so sure. But hopefully it will be a smoother experience!