I bought the Gold coloured G- ID balls and one of the thing I noticed right away was the extra distance. Drivnchaos is spot on that it gives you about 5y extra, although i've found that with the shorter irons it is a little less. The other thing these balls also does is it slows down the meter for all the clubs, here i have to say that it makes the meter run more evenly and smoother, especially the putter.
I used the new TM R9 TP driver and this new ball plus my normal tour starter clubs and posted a 28 on Bethpage black for the weekly 9-hole tourney ! The driver help me reach the green in regulation for most holes and even though i am using the old starter putter, the new ball really helped me hit the meter well and i didn't miss a putt all round, plus I sank 2 huge putts on the last 2 holes (not sure i can do that with a normal ball and meter!) to make it -7 for the round (7 birds except for hole 15 & 16). Now these balls don't last very long but I think if you used it wisely you will get your money's worth, I certainly don't recommend you use the new balls to play a social round or during practice. Also try not to hit into water or hazard cause you'll loose it completely, which is fair enough.
There's one thing which I'd like to find out though. The Gold G-ID is priced at 55 cr where as the other colours varies between 47-49 cr with the white cheapest at 44 cr. Now they seem to all have the same specs so my questions is do they all perform exactly the same way ? if so then why are they at different price ? also why is the white ball so cheap comparatively to the coloured balls, perhaps they don't last as long maybe ? I hope someone can help me with these questions.