I've read that the Ameda Purely Yours and the Lansinoh Double Electric are virtually the same pump. But the LDE doesn't come with a bag and freezer packs. But, some reviews said they had trouble witt the LDE's "diaphragm" sticking when pumping. Is it possible that the Lansinoh is a slightly cheaper, not as sturdy built pump?? Or are they EXACTLY the same, just different colors?