There's only one powertool..

[Dave Plowman (News)]

A drill sharpener that doesn't need skill to use. And does smallish ones.

[Kevin Poole]

I have a cheapo reciprocating saw (ebay "refurbished", probably NuTool or similar), and it worked a treat on composite (steel/foam/steel) panels, and would have been OK on composite roofing sheets if the blade had been half an inch longer or the insulation a bit thinner. The finish using a Hitachi 24tpi blade was fine. For plain box section roofing sheets I used an air nibbler, set such that it cut at right angles to the tool body. It coped OK with the humps and valleys. An angle grinder with composite panels raises too many interesting questions about decomposition products of the foam insulation.

I've not tried the reciprocating saw on plain box section roofing sheets: if I do, I'll probably rest the foot of the tool on a strip of ply, and cut from the wide valley side, rather than let it try to follow the profile.