Recently fitted one to my sapph cos.
Better idle (much) better low down power a lot of difference here and smoother all round.
The only thing you have to do is as you say cut wires and put on spade terminals(6.3mm) which are std size ones.
The pos and neg markings are buried down between the terminals on each side, had me searching for a while for them, there are two of each terminals on each side, but you can make do just using one if you don't want to split the connectors each side as I did.
If I had known the difference it would make for £32 I would have done it as soon as I got the car, best £32 I have spent on it.
I got mine from Matt lewis 01922 692424, £32 delivered.
tabetha