LONGER Laser B1 40W vs ATOMSTACK X40 MAX vs IKIER K1 Pro Max 48W

I’m not familiar with the Longer Laser B1 40W but I have an Atomstack X40 Pro and i love it. Easy assembly and i have never had any issues with it. I’ve heard some negative comments on the IKIER K1 Pro.

Here’s a link to someone’s comment on the IKIER