Agree about the lack of UL, but the bolts (standard threaded) going into the studs are likely the same as any other mount... if they were of lesser quality, they would sheer, not loosen or come out horizontally I.e., catastrophic fail versus warning.
I got the same thing for my 60" Panasonic... I have it extended out a bit, but yeah, feels weird moving it around. Probably because we spent $1000k on a tv and hung it on a $100 mount. Mount doesn't feel cheap, it's steel and I seen no evidence of
Would like to see some 'official' demo mounts at a store with a tv this size.
Lemme know if something bad happens and I'll do vice-versa- good luck to both of us!