Whats your fit issue? A thermo liner won't solve a boot shell thats too small or too big, but it can help alot with other issues. They are also lighter and warmer than traditional liners in my experience.
I've used Intuition, Garmont G-Fit and Raichle Thermoflex. I like the Thermoflex and Intuition more than the G-Fit which packed out and had a weird flex ime