I don't use WhatsApp but most chat apps don't work stand alone on Watch, which is a bummer, but hasn't been a deal breaker for me.

My favorite thing about the watch is that I put it on and I'm good to rush out the door at any time and I also enjoy not having a phone taking up space in my pocket.

I've thought about a flip phone since it'd be much cheaper, but I really dig having a phone in my watch (super convenient). Just wish there were more smart watches with LTE as options out there.