If something down after 2-3 years, it's time to say bye bye to sammy coz the warranty is only for a year on plasma.
Panasonic has excellent service. They came to my place once to have my S10 panel repaired and return to me in a week.

On the other hand sammy has better PQ compared to S10. This is undeniable.
All these are judgement call, ppl tend to change tv more often than they used to (say in 2-3 years).

If TS is looking for something that really last, Pana tv is the way to go. It never disappoint.

Agree with tuakeh ar188 on these.
How about if 50" tv would be 4k ish next one or two years

If you read in AVS forum carefully this buzzing thingy only apparent on PN58B650 model i.e. the 58" plasma.