Bit of a niche one this, as unless you specifically want the WiFi-enabled features then this makes no sense over the standard Charge 5. According to PriceSpy this hasn't been discounted before, so I picked one up today
So far Chromecast is working well, though I've run in to a weird issue using PlexAmp that I'll have to troubleshoot. Spotify Connect works and I presume the other things like AirPlay also do. Sounds pretty bloody good too.
Here's a review if you care https://www.whathifi.com/reviews/jbl-charge-5-wi-fi
Also $248 at PB Tech
https://www.pbtech.co.nz/product/SPKJBL6235648/JBL-Charge-5-…
$249.95 delivered from JBL
https://www.jbl.co.nz/CHARGE-5-WIFI.html