I received an order from Heirloom a few months ago that was quite different. The roses were much larger and all of them have already bloomed. The size really seems to depend on the time of year you place your order.
One thing I do have to say for Heirloom: Not one of these minuscule plants is a one-cane wonder. I'm accustomed to getting those from Vintage and Rogue Valley, and even from Roses Unlimited, so it's a nice surprise to get a tiny plant with a good cane structure.
I'm actually glad I've started using Heirloom as a source again. When I placed my first order years ago, I received two little sticks, one of which was no more than a toothpick, with no leaves. They both survived, but one is still only about a foot tall after 6 years in the ground and the other turned out to be mislabeled. I've placed a couple of orders in the last year or two, however, and have had very good luck. No more toothpicks!
