I have and shoot the G26. It is my EDC and my all-'round fun gun. I have installed the Pearce +2 magazine buttplate extensions, and it is exceedingly comfortable to grip. I carry mostly OWB (Blackhawk Serpa) but also use Thunderwear. In both cases, with the mag extensions, I have had zero issues with acquiring grip as I address a target.
My next adventure is to use G17 magazines in it with grip extensions. Essentially turns the G26 into a very short barreled G17. With a Pearce +2 mag extension, you are looking at a 19-round capacity magazine (plus one in the pipe), with a grip length no longer than that of a Glock 17, in a subcompact style.
My accuracy in slow, measured fire, as well as rapid-fire, have both improved with the mag extensions. I can dump 13 rounds into CBM at 21 feet with a 4 inch spread in about 4 seconds.
That being said, the shorter barrel does make constant practice a must to develop accuracy and muscle memory, and remember: your rounds will develop less than maximum velocity because of the shortr barrel.