Hi guys,
Haven't been in a glider for a while but I agree with Snapper1.
Once the field is made, if you need 'em, use 'em!
I have the (maybe bad...) habit of sideslipping a lot. I think it's fun. Therefore sometimes I go into final a little high. Some gliders are more stable slipping with airbrakes popped out, so while I'm in the turn from base to final, I pop the brakes and go directly into the slip.
Airbrakes, just tools to your disposition. How you use them is up to you
Just my 2cts...
Happy landings!