Yes, it would be normal for the Juliets to grow at an accelerated rate. It is an early season variety, hugely prolific, maturing in about 65 days or less. They can grow to 6' tall, and the tomatoes are like a large grape tomato or a very small roma. Reports on flavor vary, but repeatedly I read that they need to be left on the fine until super ripe and deep red for best flavor. Juliet is also reported to be very heat tolerant, and will produce for you right up until frost. Nice mistake, IMO.

I live in Michigan and bought Juliet tomato plants thinking that they were Roma. I planter almost 2 weeks late according to our traditional Memorial Day planting date. My plants are over 4 feet high and spread all over. They are covered with growing green tomatoes! I am just shocked!

Here is a link that might be useful: