Upgraded Counterpoint Hybrid SA-220 Power Amps

I have an old Counterpoint SA-220 and have always wondered if the basic, premium and gold upgrades were really really worth it. I can hear differences between the preamps and amps I have owned and auditioned but not $2K to $3K worth of sonic differences unless you really want that extra last bit of true sonics (yeah I know that I was being very general with that last comment). I am looking for anyone who has an upgraded Counterpoint power amp now or has had one in the past. Are the upgraded amps worth it? Have you compared the basic to the premium and the gold upgrades?

Thanks and Happy Listening.