@eniko My knowledge may be outdated, but IIRC, the part that breaks most often is the lamp. No wonder, as it gets quite hot. If it breaks, it may not be worth replacing.
The lamp lasts longer if you run the projector for long stretches at a time, rather than turning it on and off several times.
So, good for watching movies, binging a series or gaming. Not so good for a quick YouTube video here and there.