Most auto dark are too dark for MIG IMO. I have an auto dark adjustable shade set on #10 that I love. My problem is position and always starting the arc in the wrong place and get tired of flipping the helmet up and down to reposition or working in a confined area that you really can't flip it up. MARTINSR has a nice set up with that helmet and if I did welding for a job,would consider it myself.
Problem with some of the adjustable shade's is the "curtain" effect some of the cheap one's have. You can see the shade part before your eye's while adjusting and does not offer quality vision all across the shield.
Mine I got a harbor awhile back seem's to be a full vision shade adjust.It was around $80.00 on sale and I have not seen any like it in the store since.