Product review (4 stars): They work as advertised!
I bought these to replace the fans in an old wood-burning stove heat manifold. In my case I had to fabricate new mounts, but the fans had enough there to make it fairly easy. Quality is just good - one was a bit noisy, but by loosening the assembly and re-torqueing I got it to quiet down. Can't comment on reliability, they will get tested this winter.