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If you already have Dewalt tools and batteries that's an obvious choice. I have an Ego blower with the big 56V 7.5 AH battery and it blows like crazy. They have some great tools that use the same batteries but including a chainsaw that kicks butt, but it would be a totally new lineup for you.[/quote My Ego line up keeps on growing. I was in the same dilemma but decided to go with a whole new system. Glad I did. The blower can hold it's own against a good gas blower.
I’m running a Ryobi, just because I have two chargers and 6 batteries. I get about two weeks worth of power to keep the leaves off the deck.