I am considering taking advantage of the great deal on Amazon and buying the STS Push Pull Tower but for some reason, I keep second guessing it. I read the reviews and many of them stated that the tower wobbles. Has anyone found this to be true? Even at a sale price of $70, I'd be disappointed if it isn't very sturdy. Also, I am tall (5'8") so I am wondering if the tower will feel too short to me. I guess I just need some convincing before I make the purchase.