I've had mine, like 7-8 years now? still works awesome, although I broke the handle on it.. well worth the basically just shipping price I paid for it.. Honestly I set all mine up the same...I'll take a brand new stihl RS chain and mount it up and set my angles as close as I can... If I remember correctly it is 27-28 degrees. but yes, a sharper angle (30) will cut faster, but will aslo dull faster as the working corner is even smaller of a point. 25 is a good fast cutting angle that is durable. Some guys don't worry about the tilt angle at all, I myself like it and know its cuts faster than the same chain with a level bed angle (0).