Pretty mandatory for a GoPro.
597239
It's a great product, but difficult to get set up. Unlike it's bigger brothers, there are no micro-adjustment screws for fine-tuning. That said, when you get it, it's wonderfully smooth and makes GoPro footage infinitely better. be sure to watch YouTube videos about setting it up. beyond helpful.
2129011
Great selection of GoPro attachment accessories.
3173689
The kit has pretty much all of the accessories you would need for a GoPro. Only knock is the camera stick is little loose, and tips to the side with the camera attached. Either way I would definitely recommend.
3671181
Great asset for the GoPro, i never ran out of juice except when I forgot to reload...
3476426
Just about every application that you can think of that you need to attach your GoPro to is in this kit.
My favourite one is the floating handle. I did a lot of snorkeling with this on the GP.
I haven't used all the kit offers as yet. Just as the demand arises.
The items are diverse and the construction seems sturdy.
Nothing broken yet.
4741374
The standard plastic screws that come with the GoPro camera are really difficult to unscrew, and can be painful on the hands when trying.  These are much more ergonomic, far easier to tighten and un-tighten, and just add a little flair to the camera.  What's not to love.
2374931
Great way to mount your GoPro to a RAM mount
4410331
Consider this item an indispensable addition to your GoPro camera. It'll save your bacon if you do anything around the water. Keeps the camera afloat, doesn't add a lot of bulk, and comes with a spare back door, so you can still have a door without the float. Kept my camera afloat when I dropped it while snorkeling in Bermuda; easy to find with the bright colors.
2896294
definitely something you need if you plan on taking your go pro on long out door adventures -- this works well and is super helpful if you want to make your battery last all day -- we really wish we had this when we went skiing so we didn't have to mess with the camera as much on the mountain
850245
It's a GoPro case, it has hole it it, yay. Really it's just fine for what it is!
3734018
Excellent companion to the GoPro Camera, and although not always necessary, is very useful when needed.
1483280
It's a decent item that allows easy access to the various GoPro compartments making battery changes and SD card changes a snap. It's also the item required for using a battery replacement unit with the GoPro.
3827300
Works well and I actually wrap it around the GoPro while traveling to protect it. That was a surprising dual purpose.
4013866
Works great. seems to be sturdy. I used it for a full round of golf and it seemed to hold up well. I used it for the GoPro Hero 4 Black. includes the necessary attachment.
2323956
This GoPro Accessory kit just came in from Amazon, along with a camera and a 3rd party charger.
This kit came with nearly everything you need for the GoPro.
But I do have a couple of complaints. Likes and dislikes are listed below.

1st, some background. I have all kinds of other cameras with a much better picture quality than the GoPro is capable of. But I needed something which was a little more portable than what I have. This kit, combined with the camera, helps satisfy the portability issue.
I'll post more information about the camera and charger later under the appropriate items as I get to know more about them.

But I'll start with what I like.

I like the flotation handle which will attach to all of the other attachments.
The wrist strap, case, selfie stick, clip, headband, attachment bag, extra camera holder with tripod screw, flexible tripod, and all of the extras in this kit.
There is a generic mount with 1 inch webbing attached to it. You can buy any generic 1" strapping and hardware for all kinds of other uses for this mount.
I was definitely thankful that in addition to the extra GoPro mounts, it had tripod mounts included in this kit which I will need.
The case is semi-rigid. Hard enough to protect things inside, but soft enough to absorb bumps and bruises.
The extra bag. (explained under complaints)

Complaints:
The shoulder harness is child size or pet size.
Getting back to the case that I like. It was came packed with all of the toys in this kit. But add a camera and charger, and it wouldn't close. Something had to go. Luckily the extra bag was included.
Then there how this case opens. It opens from the opposite side of the case from the handle. If the case is not closed completely when you pick it up, then things are going to start to fall out.

This pretty much sums up my 1st impressions. I think that it is a pretty good accessory kit for the GoPro camera.
1089006
Great product. Get the helmet mount and you can replace the GoPro for anything you use a helmet for.
26963
Thank you, KNEKT, for making something so awesome, but please, get a clue about usability and "optional" accessories... This turns your go pro into the [much less costly] equivalent of a SLR housing for taking half-in/half-out photos that are so cool.

however, not including the cover for this is not cool - it's essential. Also, there are internal reflections of the go pro - very slight and depending on angle, but something that should be addressed with a hood that is INCLUDED.

this thing is the secret to cost-effective amazing photos in the water