I do think it's great, maybe not fancy or shaped and shiny, but great nonetheless.
What more you'll get with a higher end Gibson than a Studio, is just that, fancy and blingy. Cream bindings, nice fretboard and headstock inlays, etc. Nothing that makes it play or sound better.
Get a Studio...
If you were ready to put $700 on a fake, today's Standard LP, 50's or 60's have a suggested retail price of one dollar less than that.
https://www.epiphone.com/en-US/Electric-Guitar/EPINA3562/Iced-Tea
A single coil is a single coil, embrace it.
Or, move away from the amp, get a filter for its power. There's always an angle to the amp where the hum disappear.
Standard has Probuckers 2&3, Classic has Alnico Classics. Both have A2 magnets. Classic have a fairly low output at 6K compared to the Probuckers 7.75 / 8.75.
Have you tried playing with the Classics height ?
I was offered one (mint) in a trade, that would be $$ favorable to me (would cost me $250 CAD). Would be for home use only.
I am not a Marshall connoisseur. I once had an Origin 20 and didn't bond with it.
What's the good and the bad of it ?
If I don't like it, are they easy to sell ?
Nope. Spontaneous if I get one. like I see the ad, I think about it ... for a minute, and if the thought of it has been sitting in the back of my brain for some time, pounce.