I don't get all the hate for the Vap Hot Box. I'm very happy with it!
The Hot Box gives me bigger hits than my rechargeable Apollo and it's a joy to use. Having to hold a button to activate heating is no problem at all for me. The battery life is also excellent. The Apollo gives me about 75 clicks with one charge and the Hot Box ... well, I didn't count but I'm still on my first charge.
I prefer the on/off switch in the Hot Box over the one in in the Apollo. It's easy to turn on the Apollo by mistake and it happened twice already. Never had this with the Hot Box. Also, the magnet on my Apollo fell off and I have to glue it back on. The magnet on the Hot Box is smaller but that's okay. It works.
There are many reports on reddit with uneven AVB with the Apollo. I can't confirm that. I usually load up my Vapcaps with about .05 gram and the AVB is very even with the Apollo. The same for the Vap Hot Box.
I don't know anything about building induction heaters and yes, maybe the Hot Box build is questionable. But from a user perspective I really like it. I'm sure it's not on Fluxer level but I'm happy I bought one. I'm on the waiting list for a Fluxer but not sure I still need it. I might actually pass on it when I get the e-mail.