I own two U1253B, the first is about 7-8 yrs old, the second about 2-3 yrs old. They get used for 'enthusiastic hobby' use, perhaps 2 hrs total (actual on time) per week. I switch them off between measurements if more than 5mins. They live in a small lined shed, the climate here is hot-dry summers, ambient max 40C or so, cool wet winters temp 7 to 13C, inside the shed temp would vary perhaps 13 to 28C, as noted during volt-nuttery.
I have used them outdoors - not great contrast- but for a quick reasonable measurement I like the indoor contrast, display size and viewing angle - often there is stuff everywhere - and I have found the limitations of LCD a bit of a pain.
The displays seem to be doing ok to date.
A quick look at the web seems to show MTTF is worse than LCD, some figures I recall 10,000 vs 100,000hrs but I have had LCDs fail several times in my life.