I put on a SunStar 12T sprocket today, and I'm happy with the results. There is a little hill climb near my job that I run up regularly. With the new sprocket there was a noticeable difference. Starting in second gear I could blast up the hill and not run out of power. On another hillclimb with roots, rocks and mud if I didn't ,make it first shot I would have to turn back. Now I was able to rock and bump the throttle and ride on.
On the flats third gear has come into it's own. I can cruise at 30, and with a little twist I'm at 50. I haven't ridden much street yet but I rarely go much above 60 anyways. At 60 in sixth gear it's not strung completely out, and has better throttle response.
There is more noise from the chain, and I have heard that the chain will wear out faster. I beleive this because I would usually be an advocate of changing both sprockets. Since I don't want a larger rear sprocket ( one more thing to bash a rock ), and I'm not ready to buy a new chain and sprockets this will do for now. If the chain wears out really fast I will upgrade.
For anyone who doesn't run regularly over 65 I think this is an inexpensive and worthy upgrade. As I run it I while keep everyone updated, and if anybody has any experience this let me know.
"Things ain't now as they use to was been and people don't do as they use to did then". Moore Noyes