Upload & Sell: Off
From what I have read , the problem in AI servo is when object is coming at you or going away from you . Not left to right .
I discount about 10 % of the " great lens " [ from Tammy reps ] and suck-a - matic lens [ canon reps or die hards ]
This lens [ 150-600 ] is a long lens , needs different skills developed and really - there is nothing to compare to .
You have the 100-400 - you did not stick on camera and get great shots - had to learn lens .
With me the 70-200 is different than the 70-200+2X III . Same with the 135-400 and the 70-300 .
I think a lot of them will be returned because people won't take time to learn .
I am lucky in that respect , I want it for flowers I can not get to [ bad knees ] , maybe a coyote , rabbit , turtle , etc .
" Will I get decent results using the Tamron 150-600 with my Canon 7D? " Depends on your definition - blow it up 100 % and print - again why ? Printing an 8.5 X11 - should be no problem unless the IQ is more important than shot .
I am going to put a my tripod , go across street shoot a couple of roses in front yard , then hand hold to see the results . IF shots are OK on 'pod - the lens is mine .
As for Tammy fixing problem - they [ tammy ] pays canon for AF , IS and other info . BUT , I think just for EF lenses , not EFS .
Unless a lens is designed for crop , most of time it is better on a FF .