Staging - Metal vs Timber and Manufactured vs DIY

I've always made my own timber slatted greenhouse staging, but need some more and spotted these Palram galvanised metal units reduced at Wilkos online http://www.wilko.com/greenhouses/steel-work-bench/invt/0320738 and as there's £5 off £50 or more online spend at the moment and 4.25% TotalCashBack they would work out at just over £25 each if I were to buy 2. A quick pricing up of preserved timber in Wickes came to about the same amount and that didn't include for fixings. I wondered about dismantling then (keeping bolts greased) when everything gets planted out enabling some toms to be grown in pots on the floor.

They are £49.99 each on Amazon http://www.amazon.co.uk/Palram-Stee...8&qid=1373286430&sr=1-1&keywords=palram+bench