From increased cross-talk over the past year since getting VDSL2, we're down from 37-39Mbps to 25-27Mbps with heavy interleaving, high error rates and disconnects every few days to boot. Previously with ADSL2+ we got a rock-steady 18Mbps, which we could push up to 20Mbps by tweaking the SNRM. So, aside the extra upstream (about 5Mbps, up from 1Mbps with ADSL2+) we've not gained much at all from VDSL2. And the monthly bill has doubled too!