I purchased this grip for use with a Canon T5i. It fits well, all buttons work well and the whole thing feels nice. It comes with two power cartridges - one for 2 LP-E8 batteries, and one for 6 AAs. Both work well! However, it isn't perfect: I discovered that stock Canon LP-E8 batteries do not function in this unit. The battery has a lockout feature, and will not provide power until it detects it is in the camera. The grip cartridge has a third pin, presumably to trick the battery into thinking it is in the camera, but this does not work with new batteries. I just had to purchase some knock-off batteries without protection circuitry to make it work. Keep this in mind before thinking your unit is defective. The grip helps make footage more stable when using your camera in video applications. The wider grip area allows for a more secure hold. I did a full day of shooting with it, filling a 16GB memory card, and it performed as expected.