This kit is a no-brainer.  While utilizing no tools at all, you can make connections that do not leak.  I've had my system running now for 5 days, and these connections are rock solid.  Simple too, just slide them onto 1" copper, pex, cpvc.  The lines are easily bent by hand to get the angles you need.  Hand tighten the connections to the tank and simply slide over (in my case) pex, and you're done.