I went to GC in Atlanta last weekend, and I was intrigued how better the Gibson AJ was over the Epi Masterbilt.
Owning an MB guitar, I had to try the Gibson AJ.
Price: $1999 vs $699 (Gibson was all acoustic, so I figure AJ-500R w/o the electronics costs $599)
Sound: Gibson wins hands down on clarity and tone. Epi sounds muddy compared to Gibson. Gibson AJ sounded a lot tighter, focused, and more fundamental. The lows were more accurate, tighter, and deeper. The highs were clearer and sounded a lot better. The mids were better on Gibson as well.
I think I have to start saving $$$ for a Gibson now .
Whoever put reviews online saying that Epi Masterbilt is better than the Gibson AJ is wrong.
Overall, I liked '71 Martin D-35, Gibson AJ, and Taylor 710CE they had. Out of these, I think the Martin and Gibson had the best balance.
Of course, YMMV