Initially no issues. Filled a kitchen, utility and bathroom with their fittings and GU10 Bulbs. Now two years on the bulbs have begun to fail, well within their quoted 25,000 hour lifespan. The third one has now gone. First two replaced with no issues. As I didn't register the extended warranty within the required timeframe (it's in the small print somewhere and we were busy refurbishing a house), they are no longer covered. Contacted customer service who say that, although the warranty is now three years as standard, as I bought them in November 2016, sorry but they can't help. Feels like you have to jump through hoops to have an issue resolved and leaves me with little trust in the quality or longevity of the remaining bulbs I have.