Yes, I got throttled on T-Mobile, too. I have a 5GB full speed plan, and I was pushing it the first month just to test them out. I hit the limit only one day before the next billing cycle. Unfortuneately, the full speed data came back around mid afternoon and not at midnight of the new billing cycle.
During that time, i found out that if you turn off 3G/4G (HSPA+) on your phone to drop down to EDGE, you actually get faster speeds! Here's my demonstratin of EDGE actually being faster than 3G/4G (HSPA+) when throttled.