Insoles for La Sportiva Trango Extreme

Has anyone had any success replacing the manufacturer supplied insoles in La Sportiva (or similar) mountaineering boots? I am looking at several insulated insoles to try and make the boots a bit warmer. Companies like Sole offer Thinsulate foot beds and make claims of dramatic improvements in warmth over factory supplied insoles. Can anyone confirm the validity of these claims or is it all just smoke and mirrors?

Sole Thinsulate Insoles:
yoursole.com/us/mens/footbe…

I use green superfeet in mine. Seems to make a difference. I think superfeet makes an insole with a heat reflector too.