Thought it would be a fun idea since Roddick is one of the few pros who made a huge technical change to one of his primary strokes.
What I find most interesting about this whole discussion is that most everyone responds to this question assuming the change Andy made was a mistake. People blame his coaches, blame him, call him stupid, and claim that his forehand is crap now. His success and consistency says otherwise.
I don't have much to say about his technique, other than that I don't think the changes are real significant and his technique changes are very hard to compare. You can look at videos of Federer hitting forehands in different situations and find some significant differences, even in a single game in one specific match. The best players can adapt their swing/technique depending on the situation and this is where I think Roddick lacks a bit. As others have mentioned, this is also what makes it so difficult to compare strokes from completely different situations.
Anyway, I don't have a big problem with his change. All I know is that he has been ending the year in the top 10 or near the top 10 for an impressively long time. I don't know anyone else from the top 10 that has been there with him for that long, other than Federer. Interestingly, there have been significant gripes floating around this board about Federer changing his style over the years as well. At the end of the day, Roddick has been right up there with the top players for 6 or 7 years now and without the evolution of his game, it is possible he might have ended up like guys like Ferrero. This is obviously speculation, but why always assume that his change was a bad thing?
Maybe we're simply underrestimating the intelligence of Roddick and the coaches that helped him to adapt and evolve?
I haven't looked up the stats, but I suspect his matches are significantly cleaner now than 5 years ago. I'll bet his unforced errors have steadily decreased over the years and this seems like one of most noticable changse in the game in the last 5 years or so for all players at the top. You have to able to play at the highest levels possible and still maintain great consistency. From what I can tell, he has adapted his game better over the years than almost any other player I have seen since I started watching tennis. (One may be tempted to bring up Nadal to prove me wrong, but I don't think Nadal has adapted his game. I think Nadal has simply gotten better, significantly better. Also, I've never seen Nadal change a game plan or change tactics as clearly as I've seen Roddick do between playing different opponents.)
Just as he puts incredible pressure on guys beacuse of his serve, which I think get's repeatedly underrated by members of this board, his incredibly consistent baseline game has clearly worked for him. It obviously hasn't worked for him well enough to get him to number 1, or to get him to the point of hitting winners past Federer in the slams, but it has worked for him. In all hnoesty, I just don't think he is good enough to do that. Not consistently enough to come out on top. He just can't do it.
In the much the same way that James Blake understands how to play tennis to give himself the best chance of winning (at the expensive of thousands of rants on this board about him changing nothing on a "bad day"), I think Roddick understands himself, the current game of tennis, and what works even more clearly.
I think there is a lot that one can learn from Roddick's game and his style of putting non-stop pressure on his opponents to come up with tremendous shots. I think being able to choose your moments to go for it carefully and intelligently is an underrated tennis skill that is being overshadowed by these young guys coming up that simply have more natural ability.
Anyway, just some thoughts streaming through my mind as I read through all these HopRoddick threads... Hopefully I didn't bore anyone to death or say something that will turn everyone against me. I also apologize in advance for not going back and proofreading.