The Varadero's chain got changed a few weeks back after 20k miles. Chain had a slight tight spot but was needing adjustment a little too often.
Personally I'd always go for DID chains and JT sprockets. Chain and sprocket kit cost me £86 for a DID 525 X ring gold112 link (correct for the Vara, not for the strom) from M&P.
You really don't want a cheap chain snap and punch a hole in the crank case.