Some quick test using G1X + raynox 250 at my place's park. (with around 30% cropping)
Settings: ISO 640 (to get 1/200+ shutter under shade) at f8 or f11 (forgot)
Apologies if the shots aren't that good because I am not really into macro but personally I am quite pleased with the results. All shot using handheld. The only feature that's a little annoying is the camera trying to af on its own in live view while I am trying to adjust the focusing by moving my hands to adjust the distance before half pressing shutter so sometimes what the camera doing is trying to go against my focusing.