At under £100 optics are never going be fantastic but found the 2x AGS is acceptable but takes some getting use too.
Magnification has it's own problems exaggerating any shake you have, even at 2x it does cause some problems and the closer the target the worse it is. You can get a 3 MOA tube red dot for about the 100 mark which I would recommend over a scope for up to 25yds, wouldn't touch the cheaper 5-6 MOA red dots unless you got very big targets!