I bought this Pot for adding a bit of colour to my set up. I use it out the left side of my kit, and it is great for substituting ghost notes in your grooves, or even just accenting on certain fills, it is a great other voice to have.
There are not many tones to this item as it is essentially a pitched pot with a mount. But it isn't as small as you think once you start transporting it, so you will either have to throw it in your hardware case and risk getting it dinged (although its just a pot) or carry it spare, again, that is your choice, as they don't provide a case or carry bag.
The good thing is, once you put this on your set up, you don't have to play it every single time you look at it, its just added colour and choice. The choice to use it is yours, and it won't take up a tremendous amount of space. I usually apply a certain amount of muffling and try to experiment with the sound sometimes, you should too.
I love it, and people I tend to use it around seem to love it too.