ETVKPProductions:
I haven't been here for long yet but on the masters weekend I tried out the TM Rossa putter in comparison with the Ping Redwood putter I have at the moment. When comparing it seemed to me that, although the Rossa is supposed to be better when looking at forgiviness and meter speed, it didn't fit my game well. The Redwood that it less forgiving and has faster meter speed suited me much better. When thinking about it I came to the conclusion that it must be something mental like that I think the Redwood is better because I achieved nice stuff with it. Also I'm used to the Redwood. But then I looked closer and saw a difference between them 2. For me it seems like the Redwood comes off the clubface at a different speed than the Rossa putter, thereby affecting on how the breaks will react and how distance will react. The Redwood speed seems to fit me a lot better, so I went with it.
In the end it's all about how you putt and just getting used to and getting comfortable with what you have. If you have a few credits to spend I recommend that you first rent 2 or 3 putters and choose the one that suits the best to your game. If you go through a putting slump, just deal with it getting a new putter won't help you (real life expirience :P).
Hope I could help you.
I've done the same and came to a different conclusion, partly due to the mental factor.
Trying both redwoods of different level, I soon realised that I wouldn't be lucky with the lower quality of the cheaper one. It was more by feeling than by proof.
I switched between the Rossa and the Redwood with comparable results and good feeling, but I read some subjective comments that the Redwood ain't worth the money against his lower brother.
I even checked against my longtime companion, the Starter putter, but he had no chance any more, especially on the long putts.
In the end, I bought the Rossa with a positive feeling. Rational arguments were the price and the more familiar scaling of 15 - 30 - 60 - 90 - 150 over the different Redwood scaling (45?).
Having pushed my longest putt record to 61 ft and benefitting from the 15 ft scale I'll keep it for a while.
It all comes down to my favorite golf quote by Bobby Jones (American Amateur Golfer, 1902-1971):
Competitive golf is played mainly on a five-and-a-half-inch course... the space between your ears.