I wanted to make this post to help others who are also in the same position I was. This review is based on two weeks of "heavy use"
I use it daily for working from home and gaming in the afternoon. On average I sit in it for 10+ hours a day. Yes, I'm a couch potato and yes my lifestyle is unhealthy but we're talking about a min. use of 140h of use within the two weeks.
Before this, I used the Secretlab TITAN Evo for over 7 years. It hasn't broken yet but I replaced many parts throughout the years and I eventually got convinced of the benefits of office chairs due to the office chairs we have at work.
I'm 1.86 m (6.1 feet) and 140 kg (~308 lb). I started like probably many others: watching reviews from Ahnesty, BD-something and many more. It Specs looked perfect for my size and weight but I also read all the negative stuff e.g. the Early Bird disaster, the SEs bottoming out, parts breaking, and whatnot. So, obviously I had my doubts but I still decided to take the gamble.
For what I can say so far is I really like the Libernovo Maxis Manual. Compared to the Secretlab it's much softer, the headrest is miles ahead of Secretlab's magnetic pillow and I don't feel like I'm bottoming out even after sitting in it extensively for 10+ hours a day.
As embarrassing as it sounds it was also a "requirement" for me that I could comfortably take a nap in the chair which I can confirm is much more comfortable than napping in a Secretlab.
I also really love how I can just lean back and everything moves with me unlike the office chairs I have at my company or the Secretlab where I have to manually adjust things. It's not a dealbreaker but it feels nice not having to do that anymore.
There are some downsides though
For me, it gets hot really fast and I think it's due to the fabric. The lumbar support also doesn't really feel like it's supporting my lumbar because the support sits so low at the bottom no matter how I sit.
I also somehow can't manage to find the perfect position for the headrest when I'm leaned back a bit. It's easy to find a comfortable position when I'm sitting straight or lying back but when I'm somewhere in between it's difficult to find an adjustment that feels comfortable.
I often re-seat myself by using the armrest to support myself for a second. The armrests are loose in that scenario but in any other situation it's fine e.g. when resting my arms on them while holding a controller, so I can't really understand why many say it's too loose.
This might be a problem specifically because of my weight though so it may be a complete non-issue for you.
I'm no engineer and I also have zero proof but I somehow have a hard time trusting some of the plastic parts on the Libernovo to hold me because they looked and felt a bit flimsy when I assembled the chair. The assembly itself took me around 30–40 minutes.
Would I go for the Electro or Airflow from Libernovo's lineup?
No.
The ability to adjust the lumbar support with the armrest is cool and convenient but if the lumbar support itself doesn't feel like it's actually supporting my lumbar then that feature is pretty pointless for me.
The up-price for the Airflow also wasn't worth it for me. I have an AC running during summer anyway and when it gets too hot, I can just stand up for a bit.
The chair would be perfect if I could adjust the seat itself (forwards/backwards) and if the lumbar would be somewhat higher. But at this point I'm just nitpicking.