You guys need to pay attention to Al. He has been around several turnip patches and hasn't fallen off the turnip truck.He ain't one that got his knowledge on the "innerneck".
I have had several rests through the years and like the cast iron Bald Eagle best and I use my own rest top that I mfg and sell.
www.shadetreeea.com.
If you are serious you will have a heavy and stable base. You need a top and bag that securely holds your rifle and resists torque. I did chuckle at the feller that went from one rest to another and shot .1xxx groups.