I have only used mine a little more than twice a month for the last two and a half years but have had to do zero maintenance to it. Clearly I am not a high volume stringer so that at the rate I string I may never have to adjust or lubricate it. It works exactly the same as the day I got it and I test the tension calibration about every other string job and that has never needed tweaking.
When I finally hit 100 string jobs on it I am going to treat myself to a Wise tension head. Don't tell my wife though as it is a surprise.
When should you serve and volley in doubles? Only when you want to win.