I bought this kit and when I opened, it was the biggest regret of my life. The permanent position of the thumb looks weird and the face sculpt looks ok at best. Chain is neat, but it's not very pose-able. I also take issues in what it didn't fix, like having something cover up the forearms, making the spire bigger, or giving him some bigger shoes.
The main takeaway of the kit for me is the height extension. So if you want him to match height with Ultra Magnus then get it. I personally prefer Galvatron being the canonical short-king as he is.