Love my 4D 200 Tour (been demo'ing replacements in my other thread) but after a four match, 2 out of 3 set tournament my arm is cashed. Did that a few weekends in a row over the summer tournament schedule and i developed a dead arm. It's a beast, but a very rewarding beast. Maybe if you use compact strokes it wouldn't be tiring but my semi to full western forehand, big one handed topspin backhand, going for bombs on first serve, it wears me out.
Love being almost 39 and trying to play like a 16 year old!