One issue for some guys when using the "baby" G26 / 27's is the lack of a full shooting grip if trying to access the gun in a hurry. While many can do good work with these little guns if they take their time with the initial grip, etc. , a "grab and shoot" situation often ends up with the muzzle pointed only God-knows-where!
For that reason, most tend to do better with the added magazine extension...in which case I...my personal opinion only...also usually do much better with a G19 / 23 / 32 than the smaller gun. When I really "need" a defensive handgun, I want to be able to grab a "handful of gun" as someone else once stated, and most certainly not a short, "abbreviated" grip, such as that of the G27 with the standard mag plates.
For me, my G32 is no more difficult to conceal than a G27/33 with a mag extension, since the barrel is easily hidden, and it is MUCH easier for me to utilize as a serious combat handgun than the smaller guns.
I sold my G27 and have kept my G19, G23 and my G32.
JMO