I found the Gelagrub with 327th Clone today.
Two. Thumbs. Down.
Definitely not worth anything close to $25 plus tax.
The gelagrub is sculpted too small, and oddly shaped too. It's kinda long and skinny and stretched out but just too underscaled overall. This thing bombs bigtime. I had a spot all cleared out on my shelf next to my 327th squad, and now I'm decided I'm going to used a huge mound of sculpy and just do this guy myself. I know I can do better than Hasbro on this.
Just take a look at how bad Hasbro flopped on this one. First, a clone on gelagrub from the movie. Notice the overall size of the gelagrub head, and how far the clone is off the ground on it's back, how high he is:

Now, look at Hasbro's version. Notice how underscaled and smallish it is, and how the clone is practically on the ground:

Big fat "F" on this one.
And I'll let it go now due to the AT-ST high not having worn off yet. The chicken walker is so good, I'll let the gelagrub go.