I agree about To the Strongest not needing much in the way of investment. I already had a variety of felt mats when I first bought the rules so I just made my own grid on one to fit the size of the bases I use - there is no hard rule what size grid squares you use - if you got 28mm probably want bigger squares, 10mm smaller. I just used a marking pen to make dots not lined squares.
As for a deck or two of cards, most folks already own those. And a deck of playing cards is cheap anyways.
I have played many many TtS games over the years with Romans/Barbarians, Mongols/Sung Chinese, Crusaders/Muslims, Teutonic Knights/Prussians, and even use it with modifications for Great Italian Wars - gives a great game. My players love the tension of the many close games we've had. The sudden death victory conditions make for that.
I also appreciate that there are no longer any arguments over measurements..I used to hate it when two players would be arguing that those bowmen were in range by 1/2 inch or not they were not, you bumped the stand etc. Here it's clear - you are either in range or not.
Also played it at several conventions and those who have played it often ask me about where do you get the rules as they want to use that system too for their own games.