I started using them on 2/24/12. I have not had any issues with them, and yes, the LEDs are easily replaced. They are supposed to last a minimum of 5 years, so I'll probably just get a new fixture if something happens to these. I have the first generation non-dimmable units over my main display. I'd like to change them out for dimmable models in the future. Just in case I want to adjust the amount of blue and white. I'd probably end up running them at 100% anyway though.