Just my opinion, wouldn't trust them, wouldn't feel safe. Too rickety.
Sorry to disapoint on this, but depends on the fairground group!
Is this a Wilki fair?
Think they were in Llandudno last weekend. If its Wilkis they are very safe, they are old rides (new cost a fortune!) but well maintained. When in the area I do the hydraulic maintenance on them, he doesnt cut cornere....Repair or Replace, always Replacement part if available. They cant afford any downtimes or misshaps, especially with the authorities checking everything now due to past failiures in the trade.
I wouldnt go on them coz im too old and never been my thing, but had to repair and ride the Centrofugal Wheel last time and I poo`d it!!!!