[foresto]

Depends on what you mean by sync. It has limited support for tethering a mobile device to a computer on the same LAN, but lacks the kind of independent multi-device support that's a available in e.g. Matrix.

[tetrisgm]

That sounds like difficult UX. Especially when WhatsApp just works

[sshine]

When “just works” means “lacks real security”, I’d rather have something experimental.