My interest in the P229 SAO is as a carry gun, that has a grip angle and trigger action like the AXG based 320 I am competing with, and the 365 Macro I am carrying.
The optics ready P229 allows me to run the optics I like, has a trigger pull that is satisfactory out of the box and suitable for carry, is very soft shooting with +P ammo, has reliable and readily available MecGar 10, 15 and 17 round mags, and has a chunky, blocky feel that draws well from AIWB and handles recoil well. The ambi thumb safety design is the best thumb safety I have used on a carry pistol. It is essentially Glock 19 size which is a size I like. I am curious as to whether it feeds heavy hard cast loads, and plan to do some testing of the Underwood 147 hard cast load.
To JLW's point, I think the risk of the DA being in SA at the wrong time is every bit as great as the thumb safety coming off inadvertently. Even if off safe, the 229 SAO trigger isn't much different than the strikers I shoot. Now if I shot a DA/SA with a decocker as a competition gun, I might feel differently.
As to Sig reliability and quality issues, I have Rattlers, 365's and 320 based competition guns, and they just run. I bought my first P226 at the height of the terrible Cohen days against the herd recommendation. I stopped counting at 11,000 rounds or so without a stoppage or issue, and with only a half dozen quick cleanings.