We just "shot" a bunch of them a couple of weeks ago - They are awesome!
I prefer to use the 4" PowerBait Pro Grub (on a lot of different presentations) and the K-Chub Grub is one of the closest I can find to it - I've even been putting the Berkley Pro Grub tails into it and experimenting with some new color combos - I go a little "overrun" onto the tail (due to the fact that the K-Chub tail is a little thicker) but it didn't effect the bait and trimmed/cleaned easily. I also use the tails and bond them to my Pro Grub bodies.
You'll appreciate it!