I have used the Optimism v1 which is a definite step up from the supplied Wadia. Currently using 2 Optimism v2 between a Wadia 27 and 270SE. These are superb, especially on the clock link. For the data link it may be a bit too much of a good thing in that it is extremely detailed. I will continue to use the v2 for the clock link but am continuing the search for a slightly warmer data link.