I got enough kits to get a maxed out Animal Crossing, but I'll probably sell them all to the AD. I was more interested in the Mountain Reserve, and got nearly enough selection kits to max out two of them, plus a few other decent daily specials. No diamonds spent.
But I agree with those who said there weren't enough coins. I used all my starting tools chasing Mountain Reserves. I bought about two or three hammers along the way when necessary to get high level chests on days when the MR was the daily special, but other than that I never spent any coins and spent the whole event trying to save up for the large tool package. I also collected every day's free coins, did every quest, and collected every incident during the event. I'm ending the event just 19 coins short of being able to buy the large tool package.
I really wish the coins and tool costs were calibrated so that buying a large tool package early enough in the event to make a difference would have been more feasible. In terms of material rewards I did just fine without it, but the game was a whole lot more fun when I had tools to play with; it added an extra layer to the strategy. As it was, I spent most of the event without using tools, which wasn't as much fun as it could have been otherwise.