Virgin have recently increased ours to 152Mb/s down & 12Mb/s up... I've done tests and, while it's quite possible to max it out, the times when that sort of speed actually makes any real-world difference are few and far between - and that's in a house with managed gigabit switches, CAT5e wiring, RJ45 sockets all over the place and two wireless LANs
In truth, we don't currently need that sort of speed at home and it was difficult to justify when it was 100Mb/s let alone when they upgraded the feed to 120Mb/s, so I'm thinking of dropping back to one of their 50 or 100Mb/s packages