It's heavy and I did miss a number of shots trying to hold it steady. These 89 year old arms aren't what they used to be. But I love the lens. Fast, sharp and a good reach.
Canon has three different EF>RF adaptors. I got the basic no frills model and every lens I have in EF mount works with my R7, including my Tamron 150-600 G2.
I got the basic, no frills one and it work perfectly with my EF lenses.
Received as a gift a new Sigma 150-600mmlens. Photos(Osprey, Pelican, Egret and Turkey Vulture) were taken using this lens with my Canon R6, handheld, using a high shutter speed so not to show any blur through camera movement