Serving took a little getting used to as well. My speed dropped a little (but not very much) until I got used to the tension, and my placement is WAY better. Plus the added movement really helps. I actually aced my teacher several times last week (and that doesn't happen too often).
Definitely a different game of tennis at this low tension. I will keep going with it. I love the fact that I am not trying super hard to find that extra pace and spin like I used to. As I said earlier, I am enjoying the proper technique needed on every shot to get the ball where I need to. Making my strokes way better.