Its a piece of cake to use if you read all the manuals carefully.
I had the blue one in my turbo 91 se-r back in the day and made as much power with ALOT less mods than a JWT car.
Im all for it.
http://www.mohdparts.com/emanage/ is a great resource as well.
Make sure you get the optional ignition harness and use a couple of those wires to controll the injectors. You'll understand when you do some more reading. You don't need to buy the injector wires. Use the spares from the ignition harness.
EDIT* heres a pic, see the plug, you only use like 2 or so (not many) IIRC wires from that to do the ignition. Take the remaining ones and use that for the "injector harness" as it goes into that same plug.