Well, I can't explain why so many guys over at the Gibson website feel the need to talk bad about something they never had in their hands - I'm not a psychiatrist (but I guess a psychiatrist's first question would be something like "How is your relationship with your mother?"). 
But I can tell you about the Epiphone LP that I bought last year. It's an "Epiphone Les Paul Standard 1959" (the 50th Anniversary model, limited to 1959 pieces for each color) and it seems to be a lot like Joe's signature model by Epiphone. Here are the specifications:
Body Material: Mahogany
Top Material: Carved Hard Maple Cap with AAA Flame Maple Veneer
Neck Material: Mahogany
Neck Shape: 1950's Rounded "D" profile
Neck Joint: "Deep-Set" Glued-In
Fingerboard: Rosewood with pearloid "Trapezoid" inlays
Neck Pickup: Gibson USA Burstbucker 2
Bridge Pickup: Gibson USA Burstbucker 3
Controls: Bridge Volume, Neck Volume, Bridge Tone w/Mallory-150 capacitors, Neck Tone w/Mallory-150 capacitors, Switchcraft 3-way toggle
Binding: Body and Fingerboard
Fingerboard Radius: 14"
Frets: 22; medium-jumbo
Bridge: LockTone tune-o-matic/stopbar
Hardware: Nickel
Machine Heads: Vintage Style, 14:1 ratio with "tulip" buttons
Colors: Faded Cherryburst (FC), Faded Iced Tea (FT)
Includes: Hard Case, Certificate of Authenticity
Warranty: Epiphone Limited Lifetime
I'm far from being a Les Paul expert, but I'd say this is a very good guitar for the price (around 598 Euros at the moment). The setup was perfect right away. The string height was very low but there was no fret buzz. Intonation was perfect, too. The only thing I did to the setup was to increase the string height (I don't like it that low)...
If you look at the specifications, you could say that you almost get a real Gibson LP Standard for a third of the price. You get original Gibson Burstbucker pickups, quality controls, quality hardware, a long neck tenon and a thick maple cap.
OK, there's a veneer on top of the maple cap, but that shouldn't make a difference to the sound. It's just for the looks. The maple cap might be made of more than two pieces and the body is made of four pieces of mahogany (it's very hard to see - there seems to be a mahogany veneer on the back, so you can only see it if you check the lower end of the body). More pieces of wood could affect the sustain, but I'm really happy with the sustain of my Epi LP.
What else is different from the original? There's a rather thick layer of lacquer on the body (no nitro), the headstock is not as pretty as the Gibson headstock and it has "Epiphone" written on it. That's all I can think of. Anybody know something else?
If you want some opinions on this guitar I recommend the MyLesPaul forum (www.mylespaul.com). In the beginning (when the guitar was not yet available) there was a lot of scepticism. But now there are quite some people who have bought such a guitar and say that they compare really well to their original Gibson LPs! And I'm sure Joe's Epi Goldtops will be in the same class.
I think the key thing to do (with any guitar) is to test it in a shop and maybe compare it to other guitars before you buy it.
Have fun,
Rusty
"Tradition is not worshipping the ashes, but carrying the fire."