I have a cosmos racing shifter fitted and its not bad, only had it fitted for two weeks so still getting used to it, had to mod the base slightly with a file to aid 4 to 5 gear change, but overall not bad for the money ( only cost me �£22 )
I would say the B&M one is better, but over here they are nearly �£180, which unless this cosmo one fails ( which I doubt ), will remain in my wallet.