Mould King has recently introduced new roller coaster building sets but can they compete with the official LEGO roller coasters sets? We just finished building Mould King's pirate-themed Double Helix coaster and we're going to review every aspect of it and how it compares to the official LEGO loop coaster set. We'll answer questions such as: which one is more fun to build, which one looks better on display, and which rides smoother. We were recently blown away by an off-brand working bumper car