I am a real estate photographer and purchased the YN685 to eliminate blown out windows in my interior shots. The YN685 zooms to 20 mm and provides great coverage, even when I am shooting at 17 mm and using a diffuser. The YN685 does have a wide panel that will zoom to 14 mm, but I don't need that.

Works perfectly for real estate photography since I only need one channel and use only one flash. If you just want one flash that's wireless and supports E-TTL, this is a really good option! Can't comment on multiple channels or high speed sadly.