I'm from Chile, and so far we only have 1 major amusement park called Fantasilandia (or Fantasyland). Its major roller coasters are: Vekoma's Boomerang, Vekoma's Mine Train, and a Vekoma SLC called Raptor (nothing to do with B&M )
In other words, I've only took Vekoma rides, which to what I seen so far doesn't have the best reviews...
But, it means I don't know any better yet!! This is what I think of all three:
Mine Train is meh, not good, not bad. Boring.
Raptor is horripilant, VERY unpleasant, and by the time I went, the train had the "shoulder harness" (hoping it's proper engrish here), and the first drop gave me sparkles to the vision, which I suposse is a super bad signal for mental health. It gave me motion sickness and never tried it again.
The boomerang though... it was super cool IMO, and I have nothing to complain about!. It's the third roller coaster I took in my life, and even if short, feels like a huge improvement over the previous two, although if I remember correctly it valley'd back in 2015 at the cobra loop.
Other than boomerang is prone to valley, and the fact it's so common almost everyone seen one of them at least once, I don't know why many people around internet seem to really hate it. Does it have any fatal flaw I haven't yet encountered, or is it unfairly underrated? =(
I even find it conceptually creative =/