I can answer some of your questions.
As for the hammer function you turn it on only when needed, otherwise its just a standard drill. I do tile and stone work, so half the time I use the hammer function and the rest is just attaching cement board and plywood. I do however have a big roto-hammer when I need to drill big holes in concrete etc 1/2" or bigger, I don't doubt that my ridgid x2 could drill these hole, just its quicker for me.
I personally went with the 4 piece combo kit and have already used all the tools a bunch. All of them exceeded my expectations. And with a lifetime warranty, I'll deffintaly get my moneys worth.
If your decision is between 18v x2 hammerdrill and the 18v x2 its a hard choice b/c both are going to be great tools, but if you ever need the hammer function its worth the 30 extra bucks. I don't know if they offer the hammerdrill other then pistol grip other then in the combo kit so thats another thing to consider. As I love pistol grip drills for drilling and mixing, but find them unwieldy as a driver.
hope that helps, as I'm unsure if I said what I wanted to say or just got off on a tangent.
Ryan
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