They are all troublesome. Only difference between those who have had no problems is and those who will is time.
They are all fixable and serviceable. Mine has had problems since I bought it 3 years ago but the problems can be repaired if your like-minded.
Diagnostics are key. Otherwise you just throw parts at it. Mine has had the main cable replaced plus the shoes and cylinder.
This weekend I hope to replace the hydraulic system with a linear actuator similar to the other thread by Jerry Peck.
Wish me luck