$300 is more than half the cost of a Dillon 550B, which allows caliber changes and is a much better press.
If you want to load only .45acp, go ahead and buy it, but if you want to load any other caliber you will probably end up buying another press setup.
If you want to have a dedicated .45acp press, then go ahead and get it. I have four Lee Classics I've set up for loading .577/450 and .50BMG, perhaps a grand total of 50 cartridges a year. If you have the room for dedicated presses, nothing wrong with them at all.