FWIW I have just put the V-105's on my M3 (235/35 and 265/30) and my initial impression is that they are as good if not better than the MPS they replaced. The only annoyance is that the rear now seems completely un-stickable.
I've swapped my 996 C2 onto V105's - replacing S02's. Not enough miles to really tell yet, but I hope they will be as good as most Yokohamas seem to be. (am a big fan of AD08's)
Well it seems hard to find a bad review on them to about to order them. Is the 103 with the almost extra 70/80 over the 105? The 105 is a newer tyre but oddly cheaper.