I've used a bag liner before and it certainly did add some warmth. I'm not sure it added as much as they claim though, although I could be wrong. I won't be using a liner again - I got too tangled. I've also used a +5C bag and brought one of those 1 lb Down Throws they sell at Costco for about $25. I folded it over myself inside the sleeping bag, and was roasting hot in -2C for a few nights in a row last year and that was sleeping on a 3.4 R value pad. I would certainly recommend taking one of those over a liner if you're looking to add more warmth. This year I picked up an Enlightened Equipment -6C (20 oz.) quilt to try. I'm heading out the next couple weekends to the mountains so I'll be hopefully able to get an initial impression of how accurate the rating are for my body.
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