Well, I have created several assistants for writing checks, the researcher module is really good and am using it when the need is there. It is expensive but the chained search queries it does is extensive and solves my problems so... that became something invaluable.

For the normal queries and questions though I use their cheaper selections from the normal screen. My go-to is Kimi usually and I like how, unless specified, the chats disappear in 24 hours.