My most underused tool.

If you watched me play for 3 hrs you would never see me make this play. Im trying to use it more but only heads up do i really find it useful.
Is this thus ok and the way to play and use it?
(p.s i love the all in with Ax)

Stage #171172233: Holdem No Limit $0.05 [ 2005-08-15 21:49:10 ]
Seat 7 - RACEFAN29 $3.70 in chips
Seat 9 - BARKWAS $25 in chips
Seat 1 - MIFFED22001 $8.40 in chips
Seat 4 - OIGO6 $6.28 in chips
Seat 5 - T_MAC_21 $3.90 in chips
Seat 6 - KATT $3.20 in chips
*** BLIND [dealer 7] ***
BARKWAS - Post small blind $0.05
MIFFED22001 - Post big blind $0.10
MIFFED22001 - Pocket [As,Kh]
OIGO6 - Calls $0.10
T_MAC_21 - Calls $0.10
KATT - Folds
RACEFAN29 - Folds
BARKWAS - Calls $0.05
MIFFED22001 - Raises $0 to $0.40
OIGO6 - Folds
T_MAC_21 - Calls $0.30
BARKWAS - Folds
*** FLOP [Qd,Ah,6d] ***
MIFFED22001 - Checks
T_MAC_21 - Bets $0.40
MIFFED22001 - Raises $0.40 to $1.50
T_MAC_21 - Calls $1.10
*** TURN [Qd,Ah,6d,2c] ***
MIFFED22001 - Bets $2.10
T_MAC_21 - All-In $2
MIFFED22001 - returned ($0.10) : not called
*** RIVER [Qd,Ah,6d,2c,Qh] ***
MIFFED22001 - Show cards [As,Kh]
T_MAC_21 - Show cards [8h,Ad]
*** RESULT ***
Total Pot($8) Rake ($0.40)
Board [Qd,Ah,6d,2c,Qh]
MIFFED22001 - Total ($7.60) HI$7.60)Two pair, aces and queens [As,Kh - P:As,B:Ah,B:Qh,B:Qd,P:Kh]
OIGO6 - Folded on the POCKET CARDS
T_MAC_21 - HI:Two pair, aces and queens [8h,Ad - B:Ah,P:Ad,B:Qh,B:Qd,P:8h]
KATT - Folded on the POCKET CARDS
RACEFAN29 - Folded on the POCKET CARDS
BARKWAS - Folded on the POCKET CARDS

You mean the check-raise on the flop?

I think anytime you get an Ace or King TPTK with a raised pot that's a reasonable play against a player who will usually continuation bet. Probably a mix of 30% check-raise to 70% probe bets is the close to optimal.

remember, you bet out first preflop and he smooth called you from position. if i flop a nice TPTK like that in EP, i try to determine how the other player is going to play it. if they're agressive, i will just check and let them keep betting (esp. when they have small stack like that). if they're passive, i will bet out instead. the checkraise is a nice option when you are headsup like that against a smooth caller. i like the checkraise here because he minraised you after your check. but i wouldn't necessarily checkraise because i just felt like it. you have to have a reason, and here you had a couple.