I spent about $80 for a pair of Tow-n-see mirrors and I'm happy with them. However the suction cup attaches to the vehicle mirror surface, which blocks that part of it. And, when you adjust the Tow-n-see mirror, the vehicle mirror moves out of optimum position.
I'm guessing that the Milenco, attached to the mirror housing, can be adjusted separately from the vehicle mirror. True?
However, I can use my vehicle power-mirror feature to adjust the Tow-n-see mirrors, which comes in handy when backing into a site or for checking the trailer tires as I roll along.
I've been using Tow-n-see for four years with no real issues.
Vibration and holding haven't been a problem ( I clean the surfaces before installing ).
baglo