I’ve had one of these for years and it hasn’t missed a beat. I’ve literally used it hundreds of times without issue. It’s got a 4.5 star rating from 45 reviews so it can’t be too bad. Probably one of the best pumps you’ll get for $40
If you’re bending cores it might be the pump or your technique. I’ve never done it.
I don’t like screw on nozzles because I tend to unscrew the valve core far too often.
Edit: On close inspection, I’ve got an older model Giyo Air Supply with a slightly different head so my experiences might not reflect accurately on this model
So Bigadz your pretty happy with your Giyo, I really like the look of the aloy but might be tempted with the cheaper one. have you bent many cores with yours?