I was a SOB guy when I had my Glock 30. An Army Ranger I was stationed with at Ft. Benning woke me up to the issues with SOB carry.
Vehciles and chairs can be a huge problem as you'll have to lean forward to get to it while seated.
If you fall backward, you'll likely fall on that hunk of metal and polymer. Big pain, big bruises.
Holster options get limited, but they can certainly be nice.
If you're wearing a jacket or other cover garment, you may have difficulty getting to it.
Re-holstering tends to be a 2-handed effort.
I wound up going IWB on the hip or appendix, though I still feel comfortable with the SOB carry with the right firearm.
Check out what Crossbreed has to offer before you set yourself on the Galco. If memory serves, there's a Milt Sparks SOB holster out there as well. The Crossbreed Supertuck will give you the flexibility to use it SOB or shift it around on the body as/if you need.