I started playing tennis in 2004 with the 300G. I played with it until switching to the 300 Tour a year ago. My 300G was leaded to 11.8oz, and I have the 300 Tour to about the same specs.
I know from your previous posts that you want a stock evaluation, so hopefully I can help. Comparing the 300G to the 300 Tour (stock), I would say that the Tour has much more control (directional and depth). The Tour also has a good pocketing feel that I don't recall with the 300G. However, the 300G obviously created more inherent spin that the 300 Tour. Both rackets are all-court sticks, doing everything well, but the 300 Tour is definitely an improvement---although it swings very light, almost too light stock.
I demoed the Aerogel 300 (original) several years ago and found it to have a heavier swingweight (stock) than the 300G. It had more controllable power than the 300G and was great on serves. The "feel" was also different, going from carbon and kevlar to m-fil and aerogel. Although I'm relatively new to tennis and should prefer the newer technologies, I prefer the feel of carbon, graphite, and kevlar. Most would consider the Aerogel 300 an improvement to the 300G, but I preferred the "deader" feel of the 300G. So I never switched.
I am curious as well to see a comparison of the 300 Tour and the 4D 300. After a year, I'm realizing that I prefer the open string patterns as well.
After saying all of this, I've been playing better with a Volkl C-10 Pro that a friend gave me. I'm on the verge of switching to this racket exclusively, as I love the solid feel of graphite and kevlar. I know that the newer technologies are supposed to deliver comparable results in a lighter package, but I don't know that I believe it. The only issue that I vacillate upon is whethe I want to swing a heavy or lighter racket. Hope this helps.
