I own a 555BK for about 2 years. I bought she used, for a very good price.
The good thing is the Edge Pro II, which is pretty good.
I do not recommend the Lo TRS II, run away.
Yes, the Evo pups scream, with lots of harmonics, but I thought they sounded like this on any JEM...
If I had money, obviously I'd get a JEM 7xxx...
But if you're on low budget, that's a choice.
I guess the greatest problem is to compare the 555 to the Prestige JEMs.
The 555 was not made to compete with the 7xxx JEMs.
And I guess she's somewhat overpriced because of the Evos and the Vai name on it.
After milimetric setup (I made it myself), mine plays like a dream, seriously.
Here's a pic of her: