I have an AG 200 as well. I decided I wanted something heavier to force me to actually play tennis properly instead of whipping my arm around.
Borrowed a 200T from a friend a couple of months ago and played with it a lot, ultimately decided that I loved it and got a few.
And the reasoning behind the stringing machine is that - I played with a $4 set 17 gauge synthetic gut that I liked way more than an expensive Luxilon/Natural Gut setup so I was like "whatever I'm getting a machine"
I haven't strung since I was in high school but I love working with my hands and I'm excited to get back into it.