I got my axolotl from them at the beginning of this summer. When he arrived he was a touch on the small side and probably a touch to young, his back legs were not 100% fully formed. That being said he was in good health and ate pellets readily. When I got him he was around 2 inches now, about 4 months later he is between 6 and 7 inches. However I would not order from them in any extreme weather conditions, my guy arrived with out an icepack.
At my school axolotls are bred and raised in labratory conditions, and while they might not be award winning in any respect, they grow into normal sized adults, most of them about 10 inches.