The Galaxy S II is plastic. Feels plastic. And once you're used to sense, you can't go back. Every review states the sense experience is by far the best. The Galaxy's hard wear is slightly better, but not by so much that you'd notice a difference. Also, I love the feel of a more solid phone in hand. I always felt that I could drop this phone.
It is a grey import - and according to murphy something will go wrong now. But I haven't had phone problems (that I needed to take it in) for years! But my sister-in-law's phone (blackberry) gave trouble and she took it to a cell company up the road and they charged R200 to repair. And Vodacom quoted R2400 for repairs. It's still working perfectly years later. Also, if it is major problems, the company does offer one year warrantee - you just have to post it back.
I'm just glad I got it so cheap. Really wanted this phone, but I thought I'd have to give up on it and get the Galaxy again (got one listed for R4300 in Jhb) - brand new. But I didn't want to go that route. But also didn't want to downgrade.
I honestly can't wait! Already ordered stax of accessories for it!