I did actually do that with a carpet shampooer. Bought it, did the carpets, cleaned it out (but it had still quite obviously been used) and then got a refund.
However, the shampooer did turn out to be pretty useless lol so was fully justified.
RE printers. I've tried them all.., Epson x2 (always stop working, however much u pay just as the warranty wears out).., HPx2 (bought two cause they contain printer heads on the ink cartridges rather than in the printer - what was breaking on the Epsons) but they worked no longer than the Epson - in fact the second one I only used for a few months cause changed from XP to Vista and it turned out to be not Vista compatible inspite of being very expensive.
Last time I bought a refurbished all-in-one Canon printer for £64 (RRP £150+) from Ebay. The guy didn't send it for a month, then when I'd given up, sent it and took the money from my account so I ended up paying £90 in bank charges lol. Not my most successful venture ever lol. Thank god its still working. It does print out cd labels on my <cough cough> downloaded movies etc rather nicely tho lol! Manage to get original canon cartridges from ebay too (for a good price). After having a lexmark and it stopped working when I refilled it, I've never gone for anything but original cartridges since.