Experience with Bluetooth Remotes?

[ewemoa]

Am interested in some kind of small remote for controlling devices including smart phones (of the Android persuasion).  Any one have experience with the likes of the following sort?

  http://www.amazon.com/LZYDD-Bluetooth-Wireless-Control-Smartphone/dp/B00V6OFVZI/
  http://www.amazon.com/Satechi-MediaRemote-Bluetooth-Multi-Media-Control/dp/B00824948U
  http://www.amazon.com/Fintie-Bluetooth-Wireless-Multimedia-Smartphones/dp/B00WFXWKY4/
  http://www.amazon.com/HRH-338-Bluetooth-Wireless-Controller-Shutter/dp/B00UMO763S/
  http://www.amazon.com/Satechi%C2%AE-Bluetooth-Button-Series-Samsung/dp/B00RM75NL0/