At times but not common. I just told the CSR to upgrade me to 6.0 yesterday since 1.5-6.0 is in the same package now. So 3.0 to a 6.0 upgrade for free. At first i was going at 170ish for the whole night(which is slower than my normal speed at 330KBs) but this morning when i checked I was going at around 650KBs.
But to answer your question, yes Telus has had it's fair share slow downs recently. It's not like Shaw isn't :/