I had a Belkin Qode Ultimate Pro Bluetooth keyboard that needed to be reconnected via Bluetooth settings. Every 5-10 minutes. It was 169.99 Euro and it didn't work, I couldn't get service (Belkin never responded to any questions via mail, phone wasn't possible) the firmware update only worked via iOS 8 (and I had 9 on all my devices).
THAT was obscenely expensive. 170 Euro's for a keyboard that didn't work properly.
The Apple Smart Keyboard works perfectly, gives IMHO a really good feeling when pressing a key, bit short travel but not extremely these days, full-size so no adjustment between this and my MacBook Pro, is spill-proof, thin and light. Always on my iPad Pro, so worth every penny to me.