Yes. a V4 is much the same, just w/out 108 Meg wireless which I don't use.
Well, you've seen what I have got. You might gain 1 to 2 Meg going from 7 to 3 dB NM, as long as you don't get too many errors.
1999: Freeserve 48K Dial-Up => 2005: Wanadoo 1 Meg BB => 2007: Orange 2 Meg BB => 2008: Orange 8 Meg LLU => 2010: Orange 16 Meg LLU => 2011: Orange 17 Meg Untweaked 19 Meg Tweaked WBC