$25/50 river blocking bet, am I ever good here?

[DanielDayLewis]

Villain is registr8. I've been playing pretty nitty overall. Don't really have cards+pretty new to $25/50.

Party Poker, $25/$50 NL Hold'em Cash Game, 7 Players
LeggoPoker.com - Hand History Converter

BTN: $6,737.74
SB: $5,190
BB: $6,695
UTG: $14,224.64
Hero (UTG+1): $6,715
MP: $3,215
CO: $3,533.42

Pre-Flop: 8[img]/images/graemlins/club.gif[/img] T[img]/images/graemlins/club.gif[/img] dealt to Hero (UTG+1)
UTG folds, <font color="red">Hero raises to $200</font>, 3 folds, SB calls $175, BB calls $150

Flop: ($600) 3[img]/images/graemlins/diamond.gif[/img] Q[img]/images/graemlins/heart.gif[/img] 6[img]/images/graemlins/club.gif[/img] (3 Players)
SB checks, BB checks, <font color="red">Hero bets $455</font>, SB folds, BB calls $455

Turn: ($1,510) 3[img]/images/graemlins/spade.gif[/img] (2 Players)
BB checks, Hero checks

River: ($1,510) 8[img]/images/graemlins/heart.gif[/img] (2 Players)
<font color="red">BB bets $799</font>,