[Front] I purchased Wimberley replacement foot for my Sigma 150-600mm Sport Lens. The extended length of the foot helps balance the lens when fully extended in 600mm in my Wimberley WH-200 Gimbal Head VII.
It fit perfectly and was easy to install.

[Snap-On] I'm using this with a Sigma 150-600. With this foot I don't need an Arca type plate adapter to use my gimbal mount. One less connection to work loose. Also, I like the double dove-tail.

[Snap-On] Had a great chat with customer service. Turns out I needed this part to make my new set up work. This is why I shop B&H. Thanks!

[Proprietary] I replaced the factory foot with this on my Sigma 150-600mm lens. It makes a good sturdy carrying handle for the lens. I was pleased I could mount it directly to my tripod with out having to add the additional mount.

[Snap-On] Works great. Easy to install. It is just a little thinner which is great because my fingers fit between it and the lens to carry it even with thick gloves on. Stock bolts are a touch long but work. 10/10 recommend

[Snap-On] Although I can use the original foot on one of my older tripods, using an ancient Linhof pan/tilt head, these days Im in love with ARCA plates & clamps. It still surprises me that major lens manufacturers dont offer purchasers the option of an ARCA foot - maybe they arent chasing sales after all?
The Wimberley foot is easy to fit - the instructions are simple, clear and straightforward - it only took a few minutes and it was done. As solid as!
A  minor issue - once the foot was in place, it was slightly harder to park the car in the garage - I mean put the lens back in its case.  But not difficult, once you realise why.
There is also a Jobu one, which mimics the shape of both - longer, like the Wimberley one (which is an advantage, in balancing this lens, with camera) - but lower, like the one SIGMA fitted.
But its 20 bucks more and the extra height in the Wimberley one makes it easier to use this lens hand held, if you ever want to - birders, perhaps?
B&H advised me this one was the obvious choice.

[0.195 lb] The foot that comes with the Sigma 150-600mm Sports lens made the lens-camera combo too front-heavy for it to balance on the gimbal head (Oben GH-30) when in the extended 600mm position.

When using this foot instead, it balances perfectly. (Annoying that I had to pay $100, but this is a well-made product at least.)

[Front] I've paired this both with my Canon 6D and 50D and works well with either camera. The optimum combination is supposed to be 500mm and f8, but the images are sharp enough for viewing on my iMac retina display at any combination of f stop and focal length. You can take hand help pix (I need to use my wrist brace for arthritis), but I would suggest at least a monopod for any length of time. Tighten the plate with an allen key, as it was too loose with just hand tightening. The hoodie lens hood cover (size XL, not the L as stated in the accessories) fits well and once you try this lens with the lens shade you will see why the hood cover is essential. Other than size and weight, I think you could easily replace the Canon 70-300 lens (not the L) with this lens for that focal distance and have an equivalent picture. Sweet choice for anyone wanting to do wildlife photography.

[Proprietary] Until I bought the Sigma 150-600mm Contemporary zoom, the standard lens I carried into the field was Nikon's 80-400 mm. The 10 Sigma 150-600 is nearly as light but oh so very much sharper. I have photographed everything from dragonflies and butterflies to wild turkeys and Rocky Mountain bighorn sheep with it. The lens produced sharp images of each and every subject. I would and have recommended this lens to friends and acquaintances.

[Front] This replacement foot from Wimberley is simply amazing.Light and sturdy, this foot is what you are looking for to properly balance the lens on a gimbal head. 5 stars for BH too for the fast delivery.