Hi Jamsus.....I was able to borrow Busted Knuckles Tamron 150-600 for awhile last January. Granted, this is all on the 5DIII and not crop, but it is a sharp lens capable of taking some great pictures....a few of mine that I liked:
small-4786 by kayaker72, on Flickr
small-4729 by kayaker72, on Flickr
small-4687 by kayaker72, on Flickr
Again, all of those were taken on the 5DIII.
Another thing I usually do when evaluating a lens is scroll through the Flickr Groups for that lens. For example....and this was taken with the 70D....
Red Kite in Flight by Unintended_Keith, on Flickr
In short, I am coming around to the opinion that the new 100-400 II plus 1.4 TC and the various 150-600 lens are all good options. So it gets down to evaluating various features and cost against what you want/can afford. Bryan does a nice comparison of the options at the end of the 150-600C review.