I really wanted to get into a diesel because of the fuel economy so I went with the 28d. And in that regard, it does not disappoint averaging around 7.6l/100km so far. Reviews of this engine say it sounds like a tractor, which I think is a bit harsh. It does make more noise that its petro counterpart, but inside, you are well insulated from the clatter. Performance does suffer though, and the power distribution is unique. Sometimes I am pleasantly surprised, other times, I want more. But... the ride and handling are superb and I love driving it.
I'm glad I went with the 2015 and upgraded leather as the cabin feels very nice and the 40/20/40 seats makes it more utilitarian.
No reliability issues yet, but still a young car. Overall, I am pleased with my purchase and would advise you keep this on your short list if looking for this type of vehicle. The fuel savings will only off-set the extra cost if you plan to keep this car for a while, so drive the 28i and 28d back-to-back to decide for yourself.