Cause 3 traffic shape heavy users (something people often complain about VM doing)
Meh, Vodafone have been running DC-HSPA+ for a year already and O2 deployed it this summer too. EE also has it, since they run over the same network as 3, they're just keeping quiet so as to not cannibalize their "4G" sales.
And don't forget (again a frequent complaint about VM) download speed isn't everything, latency is equally if not more important. Latency on EE 4G is about half of that on 3's DC-HSPA+ (and 3's HSPA is practically the lowest latency of any in the UK).
I'm almost impressed by the download speeds though, they're an OK improvement but nowhere near what the technology is capable of. This "up to 42Mbps" is only 50% faster than Vodafone's 14Mbps service was two years ago.
(I also find it curious that 3 are claiming "realistic connection speeds" on these technologies as around about 1/3rd of what other networks offer using the same)