If memory serves, the issues was a design flaw that was difficult to fix. The newer models solved it and are a good trainer. Here's an explanation of what's going on from some website:<br><br>
First, the fluid units: While the premise behind the Kurt and CycleOps is very similar, their internal construction is quite different. The CycleOps depends on a thru-shaft that is sealed by an O-ring that keeps the fluid in its reservoir. As the rear unit heats up, friction increases; this can allow any imperfection in balance between the flywheel and the shaft to increase the wear on the O-ring seal. Eventually, the wear could cause the O-ring to wear out and the fluid unit to leak and fail. When this happens is dependent on the speed the rider uses the trainer at and the number of miles it receives – the average will probably be somewhere in the 5000 mile range (3-5 years for a rider who rides the unit regularly). While CycleOps has improved the tolerances and their quality, this is still a potential weak link in their design.