2007/2008 bikes were reputed to be the worst for surging (apart from the very early models which needed replacement ECUs/TPS). Current models don't seem to produce too many complaints from owners and if they do surge are easily fixed.

Are you sure your "2009" XT was actually built in 2009? It may well have been built in 2008, and just registered in 2009 on the documents. It is fairly common for bikes (particularly ones that sell in low volumes like the XT) to be one (or even two) model years older than they actually show on their registration papers.

Read this thread re ECUs and surging. It covers most of your questions.

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