I don't like either the Ibex or Smartwool glove liners because I find the weave to be too loose and 'mesh-y' to be very warm. They tend to get bunchy too when jammed into another glove.
After several years of being out in the very cold winter biking, fitness walking, hiking, or snowshoeing, i have found the very best glove liners (for me) to be a pair of ladies 100% cashmere gloves (not made as 'liners') that I've now been using for several years as liners. They are SO SOFT and WARM. Their softness allows them to slip right into other gloves without bunching, much better than the Ibex or SW liners. Warmer, too.
I've sewn several small holes over the years now, and am starting to search for another soft 100% cashmere pair of ladies gloves to replace them.
I guess we all find different good solutions to our clothing needs. PolarFleece items can be pretty cozy too.

Just as an aside...personally I have yet to meet a 'bike shop sales guy' who knows much of anything about wool. However they always seem to know that what they are trying to sell me is without a doubt far superior.
I remember going into one big bike shop a few years ago and asking if they carried any steel bikes, and the owner informed me that I wouldn't want a steel bike anyway because 'steel bikes aren't being made anymore by anyone'. He then added for good measure that even if I found one I'd never be able to get parts for it. lol!