I tried it and it's pretty nice indeed. But while I could convince my familie and friends to use Signal, there is no chance that they will use SimpleX. It's too unknown and "techy" for most of them.
I'm using Tuta and their app for a few years now. The app was slow indeed but it's good now, no problems so far. Lack of IMAP support is justified with security, they say. I personaly don't need IMAP as I'm completely satisfied with the app, which is available officially in f-droid btw.
I tried it and it's pretty nice indeed. But while I could convince my familie and friends to use Signal, there is no chance that they will use SimpleX. It's too unknown and "techy" for most of them.