I bought a $50 “universal site pusher” a couple of weeks ago. It would NOT budge the rear sight on my Kimber… Sent it to my favorite ‘smith’. I think he has a Wheeler. He said it was tough to get off even with his Wheeler.
I gave my pusher to a friend who swaps sights a lot, usually with just a hammer and punch, it will most likely serve him well for the occasional sight and adjusting sights.
So to make things as clear as mud, the cheap ones might work, the upper end ones will work. Like all tools, you get what you pay for. In all fairness to the ‘universal’ pusher, I have heard Kimber rear sights are notoriously hard to remove compared to other 1911 sights.