I’ve had one since about 2018 and I swear by it. Same kinda issue as you, sensitive stomach that results in 2+ BMs a day. I have the cheap kind because I have no access to the hot water or an outlet at the toilet. The cold water takes a little bit to get used to but once you’re used to it, it can be refreshing, even when it’s -40C out.

Like others I set the strength where I want and then blast the sides of the arse followed by some sustained starfish soaking. Let drip dry for a few min then use a few squares to dry and check for skids. The cleanliness afterwards is SO much higher than just TP. Plus on hot days sometimes a shot of cold water to the bum is refreshing and helps cool you down. Definitely helps with swamp ass.