I've been using a similar one as well. Specifically, the RK68 Pro.
The Bluetooth is... okay. It takes a few seconds to wake up, but it doesn't turn off for about 30 minutes. Battery life has been fine with BT 5.0. I want to say somewhere in the range of a couple weeks? All with backlighting disabled.
USB wireless is a bit of a joke, honestly. I've had it lose signal even just a foot or so away with absolutely nothing (except air) between the dongle and keyboard. I have to have the dongle at about 8" or less to maintain a reliable connection.
Overall, I'd say the keyboard is fantastic for the money. I'm truly wowed by the mechanical keyboards you can get for comparatively very cheap prices these days.
That being said, I still generally trust a company like Logitech to get Bluetooth and RF USB to be less flakey. Sure, other smaller companies get it right too, but I've had to do way more experimentation and messing around in order to find that.
Though if you can do with a wired keyboard, then I wouldn't bother with the Logitech, personally.