Thanks Jaxz!
We have the Amplify 1500 and it has kept me relatively warm on a really cold 0° night so I think the Amplify 1800, for it’s price is pretty good. I would love to buy more stuff from Aliexpress but I haven’t had a great experience with my last few purchases. We live in a rural area on a farm and shipments to this area either get lost or take forever to get here. Our trek is in 11 days so I decided to go with the Amplify 1800 for now as it has the smallest pack size (for its comfort rating) that I could find, with a good price and it ships within 24-72 hours, I’m still looking to buy another 0° comfort bag for my wife so I’ll see how this Amplify 1800 does and decide later on if it’s good enough for her.
I would still really like more opinions on this subject because a liner can really be helpful if it works well.