One of the few threads that TTPS has started that actually asks a relevant question. I have seen videos of navigator playing Matt Lin. The 2nd serve is just basically something to get the point started and yet even Matt (a solid 4.5 or close to a 5) very rarely kills it. At the rec level upto a 4.5 which is where most of the rec population would end up, it is valid to question why spend hours on a beautiful looking 2nd serve, when you'll never get it to kick consistently like a high level player. A dink 2nd serve also seems to probably give you the same percentage of points. Might as well work on other aspects of your game (assuming you have to make a choice due to time/familial commitments) such as fitness, ground and net strokes.