Just to throw my 2 cents in, I regularly (most days) maintain an Intamin Accelerator at the park I work at (shall not be named), they're really ot that bad as long as you look after them. The main issues that plague us is keeping the rope tensions equal. There is a lot of work that goes into keeping the catch car straight all the way down the launch as they like to wobble, and generally stopping things from catching (brake fins, catch car magnets etc). In terms of reliablity we don't have too much trouble, especially with the hydraulics. The larger ones here in the states are a lot more involved, I believe the one pictured only has one bank of nitrogen accumulators whereas we have 4.