They are durable cameras, although the rangefinder is prone to misalignment, and the earlier models with painted markings, rather than inscribed, didn't fare too well.
However, each model's quality of construction improved, and the cameras continue to be quite usable, despite missing paint and misaligned rangefinders.
I've had an L, R and R2 clone (Rollei 35 RF), and each has been a very nice camera. Predictable and for the most part free of mechanical issues. Meters are accurate and viewfinders are large and suitably bright.
They are good value for the money.