I had the pleasure to try Valkyria for the first time a few weeks ago. I did the single rider line (still took 50 minutes as it was an extraordinarily busy saturday) and was randomly assigned an outer seat on the front row.
I absolutely loved it! It's actually now my favourite coaster in the park. I was a dive coaster virgin before Valkyria so I don't know where it stands compared to some of the bigger ones out there, but I absolutely loved it.
Tried Helix again but it just doesn't do it for me for some reason. The hill after the inverted top hat gives some great ejector air time but otherwise I'm not much of a fan.
Mechanica and Loke were amazing. Tried AeroSpin as well but as embarrassed as I am to admit it once we got up at the top I just froze and didn't dare to spin at all!
It was somewhat windy and even the wind tipping me slightly to the side scared me to death so I just sat still and prayed for it to be over!
I got one round on Lisebergsbanan as well but that's all the rides that we had time for due to the insane crowds. I've never seen Liseberg that crowded. Next time I will definitely go on a weekday.
Liseberg really is a fantastic park and I'm glad to hear about the new dark ride coming. Now that Sagoslottet isn't there anymore that part of the park feels a bit dead. It's also the ugliest section, with it's gaudy fast food relics and random claw machine games from the 80's standing out like an eyesore in the otherwise gorgeous surroundings. I'm guessing this part of the park will be getting the makeover it deserves once the waterpark opens in that area.