Welcome. I would ask the dealer to set your key fobs to open ALL doors with one blip. At the moment one blip will open the drivers door and you need to do two to open the others and the boot. You may be happy with that but it annoyed the **** out of me and I had to return to the dealers to get the key fobs re-programmed, a job that takes minutes.
Otherwise there is nothing that stands out on the Yeti as being a known fault that you need to look out for.
For running in your new car follow the advice from Honest John from the Daily Telegraph,
http://www.honestjohn.co.uk/faq/running-in-a-diesel/
I did this and as well as loosening the engine up it also beds in all the seals and rings meaning that you don't use any oil. People who drove very gently, the old fashioned way of running the car in, seemed to use quite a bit of oil whilst those who pushed it through the gears, not over the speed limit, did not. I followed it meticulously and my oil level did not drop a bit. You may have your own method but you did ask the question.
I bought the rubber boot mat from the dealer. It was a perfect fit, I don't have a spare by the way as that may make a difference, it is very good quality and it saves the carpet in the boot from getting trashed. £25 well spent.
I have had my Yeti for nearly a year and a half now and I have been very pleased with it. It is a joy to own and drive and I genuinely have no complaints with it.