No problem in our area. I've been with Virgin (and their predecessors) since the mid '90s and have rarely had any issues.
Had some slow done a year or so back and called their help line insisting they send an engineer out. He identified an issue with the cabling entering our property, replaced it, and all has been well ever since. I'm currently paying for 350 mbs and consistently get in excess of 380.
Maybe it's a regional thing
Cliff