I have a couple Millenium L110's (21+ model) and also a mix of less expensive ladders (Menards/Sniper 16', Big Game Hunter 18.5' model, etc). The L110's are pricey but super comfortable. My issue is consistently getting a ladder stand quiet is almost impossible - even the L110's make some noise.
This is off topic but I am thinking about using more basic ladder - hang on combo setups. By that I mean one of those 14-15' cheapo ladders and then use a solid hang-on above that. I am 55 in a couple months and prefer the safer ascents-decents that ladders offer. Also, I can lean a ladder against almost any tree trunk and make it work. However, I really prefer a solid hang-on for eliminating stand noise. A cheap ladder from Menards at $45-50 gets me safely up to 15'. A larger Sniper hang-on for $45-55 hung above that gets me to 18+" and provides a safer method of transitioning into the hang-on stand. I think this might provide me the best/most affordable option as any true 18+' ladder available. I have one of these set-ups now and really like hunting from it because I can still position the hang-on between limbs/double trunks, etc, which is sometimes not an option with a true ladder stand.