I had a 2009 and never had any major issues with it. Sounds like a good deal to me. I wasn't aware that the ivory dune colour was available in the 09 AI - at least not in Australia.
The old twist n stow rudder worked OK. Just make sure it is firmly locked down when in use. The mirage drive is not an extra - it's standard. The 09 model came with standard size fins. I bought the Turbo fin upgrade kit for mine and enjoyed the extra pedal power it gave me but it works OK with standard fins. I assume you will be inspecting it prior to purchase. There's nothing like a test ride to ensure that it is sound