We used them a few times last winter for various events. Like BartmanMN said, they are indeed heavy, but if you're pulling them with an ATV or snowmobile then you're fine. It's an awesome house if you're looking to fish four people... or an even better house (in terms of room) if you're looking to fish just two... one on each side
You will need a little more heat to keep them warm, but that also depends on who is coming along... I'm fine with just a single heater, but if you have the Mrs and the kids then two heaters will be needed.
The tube size and pack size is very close to the X2, so they will move/fit then same other than the weight factor. The canvas, pole and tube are all very durable and are built to withstand a lot of abuse.
Over all, if you're looking to house more than 3 people then I would highly consider the X4 are your choice for a portable...