I've used my Elear in heavy rotation for a little over 2 years now. Hundreds if not several thousand hours. I listened to them earlier today actually. I'm not sure how you loved it and only used it 10 hours in 3 years?
Focal has had driver failure issues. I hear more about it on the Massdrop x Focal Elex than anything else and I suspect the Elex might be made with drivers that don't meet quality control spec for the Elear but I don't know that for sure. I've heard they do quite well with warranty service so just make sure you buy from an authorized retailer and register them for the warranty.
I'm still getting a Clear at some point. 🙂
The HD800 is a completely different experience from a punchy, dynamic Focal headphone.