There is a series of very in depth podcasts about this from Blister. They chat with one of the team from Atomic who describes how they balance the first fit feeling with actual comfort after hours of use. I think rental boot liners are often padded out with thicker, softer foam which makes them feel comfy when they are new and you first put them on, but then eventually they pack out, your foot slips around and they just feel dogshit.
True. I found that getting my own boots was a big step up (although I haven't used them in a good few years). Also wearing proper skiing socks, which are fairly thin and not big fluffy monstrosities makes quite a difference in terms of feeling in control.
There is a series of very in depth podcasts about this from Blister. They chat with one of the team from Atomic who describes how they balance the first fit feeling with actual comfort after hours of use. I think rental boot liners are often padded out with thicker, softer foam which makes them feel comfy when they are new and you first put them on, but then eventually they pack out, your foot slips around and they just feel dogshit.