(55) Getting Fancy A9 BB hand

[ace_in_the_hole]

Is this total donk or a decent play?

NL Texas Hold'em $50 Buy-in + $5 Entry Fee Trny:17316354 Level:3 Blinds(25/50) - Friday, November 11, 03:00:02 EDT 2005
Table Table 68159 (Real Money)
Seat 8 is the button
Total number of players : 6
Seat 1: SMELLY_FISH ( $1145 )
Seat 2: forever_win ( $870 )
Seat 3: Narrator ( $1665 )
Seat 8: natural34ds ( $3845 )
Seat 9: hello_world1 ( $750 )
Seat 10: HERO ( $1725 )
Trny:17316354 Level:3
Blinds(25/50)
** Dealing down cards **
Dealt to HERO [ 9h As ]
SMELLY_FISH folds.
forever_win folds.
Narrator folds.
natural34ds raises [100].
hello_world1 folds.
HERO calls [50].
** Dealing Flop ** [ 3c, 5c, 4c ]
HERO checks.
natural34ds bets [50].
HERO calls [50].
** Dealing Turn ** [ 3h ]
HERO checks.
natural34ds bets [50].
HERO calls [50].
** Dealing River ** [ Tc ]
HERO bets [300].