IMO it has definatley more going for it than against it. Once you get used to the unit rebalancing (to the way it should be) you'll be wondering why you didnt download it sooner.
The battle AI seems a lot smarter, I lost to the mongols in my Turkish campaign probably 3 times in decisive battles, that I know I would have won in vanilla 1.2 (allbeit with lower grade troops at the time).
The diplomacy works better too.
If you don't have Kingdoms (like me), version 3.1 is all you need. Plus it is a very simple download which creates its own icons on your desktop,so is very easy to operate. Also the other plus that I have noticed is that on my system, the mod has never crashed, unlike what I have heard happens on many other mods.
I'm much like you Reise, I don't like change at all, but I bit the bullet and went for it and havent looked back.
Best of luck which ever way you choose!

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