I have two lyres of this type for some years now, purchased together with 6 575 scans of the same brand. I have never encountered any problems related to their use, no failure either. This is a great model, very strong at that. Paid at the time 12,000 francs (1800 euros or so), I think we can find around 9000 francs Now (1400 euros).
With hindsight and experience, I would not advise using these lyres outdoors. The lamp power is not enough. For the inside on the other hand, no complaints. The colors are bright, fast and precise movements. Very good equipment.