A good deal came up on the Olympus 9-18mm in my city. Never though about owning an ultra wide angle before, having got used to 12mm on my 12-50, and occasionally the 9mm fisheye bodycap for interesting perspective shots. Should I get an ultra wide angle? Anyone get one and find it difficult to use, and sold it on again? Will I love it instantly or is it a matter of "if you're not sure, then you probably don't need it" I know this thread will be full of "i love mine, couldn't live without it", but wondering if it's like that for all owners.