Does anyone have any recommendations for these? I'm wanting to buy 2. I presently have just vents, but am wanting to replace with electric units. I've conducted a lot of research into these and unfortunately there are multitudes of bad reviews for the models which seem to be popular such as Maxxfan and Fan-tastic. I was settled on the Mazxxfan 6200k models and read reviews on Amazon, they were predominantly bad. Seems like many are having circuit board issues. Also, evidently this model requires a voltage regulator to be installed if running solar. Its fantastic fan counterpart earned similar poor reviews. It's really hard to tell if this is a bad batch situation due to extended supply-chain issue coupled with QC oversights, or maybe Amazon is selling knockoffs. So many swear by the maxxfan, but just a cursory search reveals that recent buyers are plagued with issues. I was thinking okay, I'll buy the top model then the 7500k, but again, tons of issues. The "permanence" of this feature dictates that I want to get it right. Any guidance is appreciated.