The different sizes are a really option to have, especially for when you want more control and less lube
The 0 and 00 are all I ever need, before I found these I was cramping my hand on a small brush with no grip area, these are definitely worth it for those long lube sessions
The larger grip area on the brush makes it easier to hold. Texture of the brush handle is also grippy, not smooth. I've washed the brush several times and the text hasn't faded away, so I guess you won't lose track of which brush is which size.