It is all in the application as the others have said.
I watch for the stuff to go on sale, and hopefully combine with a coupon as well.
I also kind of figure on some things the way it works for me is like this.
I buy the tool (lets say the small concrete mixer)
I buy the 2 year service plan.
I have $200 into our light duty Concrete mixer that the wife likes to use (as opposed to the heavy duty one.
It WILL last me 2 years, although I may have to assemble several more at some point along the way
First job we used it on, Paid for it in what I would have paid in rental of one, and I did not have to return it constantly. Many of our large jobs get spread out over a week or two as mowing customers etc. still have to be done. By owning the machines ourselves (tamper, concrete mixer etc.) I just leave them on site and don't worry about returning them, I also do not have to fool with detailed cleanup (obviously you want the drum clean, but not so clean as to return it to the rental yard)
I guess for my money, many of their tools are fine. I will second the opinion on the electric hand tools though, but I may just buy their big demo hammer they have on sale right now.
Again, buy the two year warranty, they swap it out when there is a problem, and I look at it as kind of a 2 year rental plan.
And this type of tool, in the construction trade, often does not last 2 years anyway, not so much because of the quality of the tool, but because of the environment, and care (or lack therof) of the tools.
I walked in the back yard yesterday, too see our plate compactor sitting in the yard, 20' from the shed it is supposed to be in

Sometimes it is funny, other times it frustrates me.