I've thought about one of these too.
I suggest you pop along to your friendly outlet and actually get to handle one, fully set up with battery. The 3.3 Kg weight (incl. battery) doesn't sound too bad - but only you will know if that's OK for you to wield around.
Back to my comment about are you a big strong bloke
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I know of a chap with a self rebuilt, immaculate, Series 1 E Type who swears by a 3/8" drive one because it tackles 90% of the fixings and is far more manoeuvrable. The odd things that need bigger and stronger he calls for reinforcements
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