I have a couple generic bluetooth keyboards and the Nexus 9 folio, they work fine. But the synergy of the OEM stock keyboard can't be beat. Feels great, changes the productivity of the tablet 10 fold! I had a metal one that didn't turn on or charge, used as a stand, nothing beats it. I caught a bargain on eBay, luckily it works. The induction charging is superb, no extra cables or charger to lug around. Might be worth paying the premium price just for the Google support and warranty. I dished out an extra $12 for the square-trade protection.