The G30S isn't an option in our household. Both of our Gen3 G30SF pistols will be upgraded to G30 Gen4 because we require support for caliber conversions we already own, and another in the planning stage, for woods protection and sport.
Below is what I've written comparing the G30 and G30S taken from the post linked in my signature line below.
The widths of the pistol grip and slide are important factors for concealed carry. If your body type and/or wardrobe is suited for only a slim pistol this could be an issue. Consider the recently released Gen3 G30S 45ACP pistol if a slimmer slide is better suited for your needs and preference. The G30S is a Gen3 G30SF (10+1) frame topped with the slimmer, lighter slide of the G36 pistol and a G36 barrel with smaller outside diameter. The width of the G30S slide at 1.004" ± 0.002" is 1/8" less than the G30 slide (1.126" ± 0.002"). However, the width of the G30S grip at the widest point is the same as all other G30 models (1.28 inch), thus only a modest improvement in concealability can be expected. The G30S weighs 3.53 oz. less than the G30 Gen4, which is ~10.5% less overall with a full mag, and many will like that the most about the G30S. A holster designed for a G30 pistol appears to be the surest bet to fit the G30S. Holsters designed for a G19/G23 are
hit or miss in properly fitting the G30S from early reports. On the other hand, some owners report the G30S will fit the occasional holster suitable for a G36 or even a G26. Buyer beware, try them before buying.
The consensus opinion from early reviewers of the G30S is the new pistol has more perceived recoil and muzzle flip than the Gen3 G30/G30SF or Gen4 G30. It is noticeable, especially with +P ammo, but still comfortable to shoot. This is no surprise considering the G30S upper is 3.5 oz. lighter and slide velocity is higher. Some expert shooters, in tests of the G30S of hundreds of rounds fired, have noted that the G30S is an accurate pistol but not the equal of the G30/G30SF or requires more effort to shoot as well.
In contrast to the G30S, the Gen3 G30/G30SF and Gen4 G30 with the thicker, heavier slide are the best option (the only option in my opinion) if you have any plans or desire to convert your pistol to .460 Rowland, .40 Super, 10mm Auto or other high-energy pistol calibers for woods protection or sport. Aftermarket conversion barrels commercially available for the Gen3 G30/G30SF and Gen4 G30 are not interchangeable with the G30S barrel.
It's highly doubtful that the G30S, with a much lighter slide, will be a comfortable and safe pistol to shoot .45 Super ammo. The G30S is designed for 45ACP +P (23K psi) and that's the end of the road. I fear for the brave/reckless G30S owner who shoots .45 Super (28K psi) in the G30S factory barrel and slide. I'm anxious enough as it is shooting 45 Super in the G30 factory barrel. The heavier G30 slide and aftermarket barrels are on the ragged edge of sufficient mass to make high-energy caliber conversion feasible, safe and reasonable to shoot comfortably. Even with the heavier slide and barrel, some G30 conversions need a compensator for added mass at lock-up and recoil attenuation (.460 Rowland and .40 Super). The G30S is a 45ACP pistol exclusively and that's plenty good for the vast majority of people who will buy the G30S.
On the positive side of a larger G30/G30SF slide, the width of the standard slide (1-1/8 inch) is a perfect match for the Trijicon RMR red dot sight mounted on a milled slide. It's a truly awesome combination with tall, suppressor night sights for co-witness backup iron sights. This configuration is becoming increasingly popular for daily CCW use.