DS would love a toy like that- and he's only just over a year old. Heck, his grandparents have been giving him toy 'tools' since quite early on. His grandfather, in particular, is thoroughly enjoying that he seems to be a very stereotypical boyish boy. Personally, I'm just happy he's so loved. when something isn't age appropriate for him, I set it aside, they grow so fast that I know he'll be old enough for it soon enough.
Of course, if one of those had come into this house, his older sister would have pounced on it immediately.
I tend to think we overworry- as parents- about the effect a single toy will have in the grand scheme of a child's life. I can certainly attest that the toy vaccuum my daughter had when she was small has not forced her to become a miniature stepford wife.
If you think chainsaws are evil as a general rule- I suppose you could get rid of it, but it seems like a great chance to discuss how to use such tools responsibly. It isn't the chainsaws that are the key to deforestation, they are much too slow and inefficient when logging companies are using much more efficient machinery. Having grow up with wood heat, and having wood heat in our home as well, a chainsaw is a necessary tool. We teach our kids about which trees are good to harvest for wood, and about those we leave alone. We emphasize sustainability- and balance.
Ultimately though, I would want my kids to learn that relationships and people ar more important than a toy.